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  Subjects -> ENGINEERING (Total: 2417 journals)
    - CHEMICAL ENGINEERING (207 journals)
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    - ELECTRICAL ENGINEERING (111 journals)
    - ENGINEERING (1267 journals)
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ENGINEERING (1267 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 21)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 14)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 272)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 7)
Advanced Journal of Graduate Research     Open Access  
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 18)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 17)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 44)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 3)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 35)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 26)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 24)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Antarctic Science     Hybrid Journal   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 18)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 5)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 28)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Motor Trade Survey     Full-text available via subscription  
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Bilge International Journal of Science and Technology Research     Open Access  
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 11)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal   (Followers: 1)
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Bitlis Eren University Journal of Science and Technology     Open Access  
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 42)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 5)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal  
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 3)
CienciaUAT     Open Access   (Followers: 1)
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 13)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Full-text available via subscription   (Followers: 9)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 6)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 2)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 14)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 28)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 277)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 208)
Composites Part B : Engineering     Hybrid Journal   (Followers: 248)
Composites Science and Technology     Hybrid Journal   (Followers: 191)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access   (Followers: 1)
Computational Geosciences     Hybrid Journal   (Followers: 16)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Science and Engineering     Open Access   (Followers: 19)
Computers & Geosciences     Hybrid Journal   (Followers: 31)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 7)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 33)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)

        1 2 3 4 5 6 7 | Last

Journal Cover
Acta Metallurgica Sinica (English Letters)
Journal Prestige (SJR): 0.576
Citation Impact (citeScore): 2
Number of Followers: 7  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1006-7191 - ISSN (Online) 2194-1289
Published by Springer-Verlag Homepage  [2350 journals]
  • Influences of Asymmetric Reduction Rolling on the Microstructure and
           Mechanical Properties of AZ91
    • Authors: Yi-Quan Zhao; Hong-Mei Chen; Jing Zhang; Ru Ma; Yan-Dong Liu; Yi-Nong Wang; Ling Wang; Qun Zhang; Wei-Gang Li
      Pages: 673 - 680
      Abstract: The influence of asymmetric reduction rolling (ARR) on the microstructure, texture and mechanical properties of AZ91 was investigated. The microstructural characteristics of the AZ91 sheet processed by symmetric rolling (SR) were the twins, intersection of twins and dynamic recrystalization (DRX) grains around the coarse grains and within the twins. However, the amount of twins and DRX grains in ARRed AZ91 was much smaller than that in SRed AZ91. The SRed AZ91 after annealing exhibited fine DRX grains and some coarse grains with a size of ~ 100 μm. The grains in ARRed AZ91 after annealing were much finer and more homogeneous than those in SRed AZ91 after annealing. The intensity of basal texture of ARRed AZ91 after annealing was lower than that of SRed AZ91 rolling after annealing. The average Schmid factor of ARRed AZ91 is 0.34, which is higher than that of SRed AZ91. The yield strength and ultimate tensile strength of the ARRed AZ91 sheet were increased to 16.1% and 31.8% compared to SRed AZ91 sheet, from 155 to 180 MPa, and from 220 to 290 MPa, respectively. The improvement of mechanical properties in ARRed AZ91 after annealing was attributed to much finer, more homogeneous DRX grains and weaker basal texture.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-017-0695-z
      Issue No: Vol. 31, No. 7 (2018)
       
  • Grain Refinement During Directionally Solidifying GCr18Mo Steel at Low
           Pulling Speeds Under an Axial Static Magnetic Field
    • Authors: Yuan Hou; Zhen-Qiang Zhang; Wei-Dong Xuan; Jiang Wang; Jian-Bo Yu; Zhong-Ming Ren
      Pages: 681 - 691
      Abstract: The present work investigates how axial static magnetic field affects the solidification structure and the solute distribution in directionally solidified GCr18Mo steel. Experimental results show that grain refinement and the columnar to equiaxed transition is enhanced with the increases in the magnetic field intensity (B) and temperature gradient (G) and the decrease in the growth speed. This phenomenon is simultaneously accompanied by more uniformly distributed alloying elements. The corresponding numerical simulations verify a thermoelectric (TE) magnetic convection pattern in the mushy zone due to the interaction between the magnetic field and TE current. The TE magnetic convection in the liquid should be responsible for the motion of dendrite fragments. The TE magnetic force acting on the dendrite is one of the driving forces trigging fragmentation.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-017-0691-3
      Issue No: Vol. 31, No. 7 (2018)
       
  • The Relationship Between Oxidation and Thermal Fatigue of Martensitic
           Hot-Work Die Steels
    • Authors: Qi-Chuan Jiang; Xu-Min Zhao; Feng Qiu; Tian-Ning Ma; Qing-Long Zhao
      Pages: 692 - 698
      Abstract: Thermal fatigue behaviors of two forged hot-work die steels subjected to cyclic heating (650 °C)–water quenching were investigated. A martensitic hot-work die steel containing 10% Cr (HHD), showing superior oxidation resistance and thermal fatigue resistance to the commercial martensitic hot-work die steel (Uddeholm DIEVAR®), was developed. The maximal crack length in HHD was 35% shorter than that in DIEVAR after 2000 thermal cycles, and the hot yield strength at 650 °C of HHD was 14% lower than that of DIEVAR prior to thermal fatigue testing, which is 30% higher after 1500 cycles. It is found that cracks initiated and propagated along the oxide layers in the grain boundaries, suggesting that the oxidation-induced thermal fatigue cracks can significantly reduce the mechanical performance and service life for the hot-work die steel. High-temperature oxidation behavior is crucial for thermal fatigue crack formation, while high-temperature yield strength and ductility play a less important role.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-017-0699-8
      Issue No: Vol. 31, No. 7 (2018)
       
  • Effect of Mn Content on Microstructure and Cryogenic Mechanical Properties
           of a 7% Ni Steel
    • Authors: Hong-Wei Cao; Xing-Hong Luo; Guo-Feng Zhan; Shi Liu
      Pages: 699 - 705
      Abstract: The effect of Mn content on the microstructure and cryogenic mechanical properties of a 7% Ni steel was investigated within the Mn content range from 0.13% to 0.36%. The microstructure of the steel as determined by optical microscopy, scanning electron microscopy, transmission electron microscopy, electron backscattering diffraction and X-ray diffraction was presented, and the low-temperature mechanical properties were given. The size of prior austenite grain did not change a lot as Mn content increased. Film-like reversed austenite, having high stability, was found mainly in the specimens with lower Mn content; however, in the specimen with the highest Mn content, the role of Mn was not obvious in stabilizing reversed austenite. Besides, with increasing Mn content, the amount of reversed austenite at grain boundaries gradually decreased. The variable Mn content had a significant effect on cryogenic toughness, but not apparent on cryogenic tensile strength or yield strength. An excellent combination of cryogenic tensile and impact properties was obtained when Mn content of steel was 0.13%.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-018-0700-1
      Issue No: Vol. 31, No. 7 (2018)
       
  • Improvement of High-Temperature Mechanical Properties of Low-Carbon RAFM
           Steel by MX Precipitates
    • Authors: Jianguo Chen; Yongchang Liu; Yantong Xiao; Yihuan Liu; Chenxi Liu; Huijun Li
      Pages: 706 - 712
      Abstract: To investigate the influence of tantalum content on high-temperature mechanical properties of low-carbon reduced activation ferritic/martensitic (RAFM) steels, RAFM steels containing different tantalum contents (0 and 0.073%) were fabricated, and the tensile tests at room temperature and high temperature were performed, as well as the creep tests were conducted at 550 °C with the applied stress of 180 and 220 MPa. It was found that 0.073% tantalum addition results in the increase in amount of stable carbonitrides (MX), and the creep rupture time of the steel under 180 MPa is obviously increased. In addition, the increase in MX caused by tantalum addition also leads to the improvement of high-temperature tensile strength. The improvement of high-temperature mechanical properties of RAFM steels is primarily related to the evolution of precipitates.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-018-0703-y
      Issue No: Vol. 31, No. 7 (2018)
       
  • Micro-scale Cellular Automaton Modeling of Interface Evolution During
           Reaustenitization from Pearlite Structure in Steels
    • Authors: Gang Shen; Cheng-Wu Zheng; Jian-Feng Gu; Dian-Zhong Li
      Pages: 713 - 722
      Abstract: A modified cellular automaton model is developed to depict the interface evolution inside the cementite plus ferrite lamellar microstructures during the reaustenitization of a pearlite steel. In this model, migrations of both the austenite–ferrite and austenite–cementite interfaces coupled with the carbon diffusion and redistribution are integrated. The capillarity effect derived from local interface curvatures is also carefully considered by involving the concentration given by the phase diagram modified by the Gibbs–Thomson effect. This allows the interface evolution from a transient state to a steady state under different annealing conditions and various interlamellar spacings to be simulated. The proposed cellular automaton approach could be readily used to describe the kinetics of austenite formation from the lamellar pearlites and virtually reveal the kinematics of the moving interfaces from the microstructural aspect.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-018-0706-8
      Issue No: Vol. 31, No. 7 (2018)
       
  • Degradation Characters of La-Mg-Ni-Based Metal Hydride Alloys: Corrosion
           and Pulverization Behaviors
    • Authors: Yi-Ming Li; Yang-Huan Zhang; Hui-Ping Ren
      Pages: 723 - 734
      Abstract: Degradation behaviors of three typical La-Mg-Ni alloys, La2MgNi9, La1.5Mg0.5Ni7 and La4MgNi19, were studied. La1.5Mg0.5Ni7 with (La,Mg)2Ni7 as main phase presents better discharge capacity and cycling stability. The three alloys suffer severe pulverization and corrosion after electrochemical cycles, which are considered to be the significant factor attributing to the capacity deterioration. However, the overall corrosion extent of the three cycled alloys aggravates successively, which is inconsistent with the result that La2MgNi9 presented poor cycling stability and also the assumption that alloy with high Mg content is easy to be corroded. The intrinsic anti-corrosion and anti-pulverization characteristics of the three alloys are mainly focused in this work. Immersion corrosion experiments demonstrate that the Mg-rich phases are more easily to be corroded. The corrosion resistance of the three alloys presents an improved trend which is inversely proportional to abundance of the Mg-rich phases. However, the anti-pulverization abilities present an inverse trend, which is closely related to the mechanical property of various phase structures. LaNi5 with the highest hardness is easy to crack, but the soft (La,Mg)Ni2 is more resistant to crack formation and spreading. Thus, the weaker corrosion of La2MgNi9 after electrochemical cycling is attributed to the better intrinsic anti-pulverization capability though the anti-corrosion is poor. As La4MgNi19 possesses excellent corrosion resistance, enhancement of the anti-pulverization ability is urgent for improvement in the cycling stability.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-017-0696-y
      Issue No: Vol. 31, No. 7 (2018)
       
  • Dendritic Boundary Corrosion of AA2198 Weld Using Fiber Laser Welding with
           Al–Cu Filler Wire
    • Authors: Jun-Xia Lu; Ling Chang; Shi-Kai Wu; Shi-Kun Yin
      Pages: 735 - 741
      Abstract: The microstructures and corrosion behaviors of AA2198–T851 alloy and weld were analyzed under corrosive conditions. Weld was formed using an innovative fiber laser welding process with AA2319 Al–Cu filler wire. The metallurgic morphology and distribution of the chemical compositions were determined using imaging techniques such as optical micrograph, scanning electron micrograph, high-resolution transmission electron microscopy, energy-dispersive X-ray spectrometry and X-ray diffraction. Corrosion was evaluated using an immersion test and electrochemical impedance spectroscopy in 3.5% NaCl solution at room temperature. Results indicate that the parent alloy suffered from pitting corrosion during the initial 4-h immersion which was caused by the inhomogeneous distribution of its chemical components and the different intermetallics formed during the rolling process. The weld experienced dendritic boundary corrosion under the same conditions due to the addition of the Al–Cu filler and rapid solidification during laser welding, which led to the precipitates Cu enrichment along the grain boundary. When a welding joint was immersed in the solution for 5 days, a big crack was observed across the center of the weld. In comparison, there was good corrosion resistance in the heat-affected zone with a compact protective film.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-017-0698-9
      Issue No: Vol. 31, No. 7 (2018)
       
  • Microstructure and High-Temperature Oxidation Behavior of Dy-Doped
           Nb–Si-Based Alloys
    • Authors: Yue-Ling Guo; Li-Na Jia; Hua-Rui Zhang; Bin Kong; Yong-Lin Huang; Hu Zhang
      Pages: 742 - 752
      Abstract: Microstructures and oxidation behaviors of four Dy-doped Nb–Si-based alloys at 1250 °C were investigated. The nominal compositions of the four alloys are Nb–15Si–24Ti–4Cr–2Al–2Hf–xDy (at.%), where x = 0, 0.05, 0.10 and 0.15, respectively. Results showed that the four alloys all consisted of Nbss, αNb5Si3 and γNb5Si3, and the addition of Dy produced no obvious effect on the phase constitution and the microstructures of Nb–Si-based alloys. After oxidation at 1250 °C for 58 h, it was found that the addition of Dy accelerated the oxidation rate of Nb–Si-based alloys and caused a larger weight gain, accompanied by the formation of a more porous and less protective oxide scale. The oxides of Nb2O5, Ti2Nb10O29, TiNb2O7, Ti0.4Cr0.3Nb0.3O2 and glassy SiO2 were formed on Dy-doped Nb–Si-based alloys. The high-temperature oxidation mechanism of Dy-doped Nb–Si-based alloys was discussed.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-018-0701-0
      Issue No: Vol. 31, No. 7 (2018)
       
  • Characterization of Interfacial Bonding Mechanism for Graphene-Modified
           Powder Metallurgy Nickle-Based Superalloy
    • Authors: Jin-Wen Zou; Xiao-Feng Wang; Jie Yang; Chuan-Bo Ji; Xu-Qing Wang; Xian-Qiang Fan; Zhi-Peng Guo
      Pages: 753 - 760
      Abstract: A modified FGH96 superalloy using 0.1 wt% graphene was successfully prepared using the wet mixing method. The interfacial bonding mechanism between the graphene and the superalloy matrix was characterized using optical microscope, scanning electronic microscope, transmission electronic microscope and X-ray tomography. The results revealed that the graphene could be dispersed uniformly inside the matrix of the superalloy, and the bonding interface between graphene and the superalloy showed a rather diffusion instead of abrupt distinction, suggesting that the interface was formed via chemical fusion rather than a mechanical combination. The uniform dispersity of the graphene inside the superalloy matrix could improve the tensile properties significantly, including tensile strength, plasticity and yield strength. The existence of the graphene at the fracture surface further verified that the graphene could increase the effective bearing force of the material during the tensile test.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-018-0705-9
      Issue No: Vol. 31, No. 7 (2018)
       
  • Microstructural Characteristics and Mechanical Behavior of Spark
           Plasma-Sintered Cu–Cr–rGO Copper Matrix Composites
    • Authors: Xin-Jiang Zhang; Zhong-Kui Dai; Xue-Ran Liu; Wen-Chao Yang; Meng He; Zi-Run Yang
      Pages: 761 - 770
      Abstract: Copper matrix composites were prepared through spark plasma sintering (SPS) process, mixing fixed amount of reduced graphene oxide (rGO) with the different amounts of Cr. In the sintered bulk composites, the layered rGO network and uniform Cr particles distributed in the Cu matrix. Both of mechanical blending and freeze-drying stages of the wet-mixing process obtained the Cu/Cr/rGO mixture powders, and then SPS solid-phase sintering realized the faster densification of these mixture powders. The hardness and compressive yield strength of the Cu–Cr–rGO composites depicted the higher values than those of pure Cu and single rGO-added composite, and they were gradually increased with increasing Cr. The rGO/Cr hybrid second-phases are believed to be beneficial to strengthening Cu matrix. The relevant formation and strengthening mechanisms involved in Cu–Cr–rGO composites were discussed.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-018-0711-y
      Issue No: Vol. 31, No. 7 (2018)
       
  • Carbon Dioxide Sequestration via Steelmaking Slag Carbonation in Alkali
           Solutions: Experimental Investigation and Process Evaluation
    • Authors: Chen-Ye Wang; Wei-Jun Bao; Zhan-Cheng Guo; Hui-Quan Li
      Pages: 771 - 784
      Abstract: Carbon dioxide mineral sequestration with steelmaking slag is a promising method for reducing carbon dioxide in a large-scale setting. Existing calcium oxide or calcium hydroxide in steelmaking slag can be easily leached by water, and the formed calcium carbonate can be easily wrapped on the surface of unreacted steelmaking slag particles. Thus, further increase in the carbonation reaction rate can be prevented. Enhanced carbon dioxide mineral sequestration with steelmaking slag in dilute alkali solution was analysed in this study through experiments and process evaluation. Operating conditions, namely alkali concentration, reaction temperature and time, and liquid-to-solid ratio, were initially investigated. Then, the material and energy balance of the entire process was calculated, and the net carbon dioxide sequestration efficiency at different reaction times was evaluated. Results showed that dilute alkali solution participated in slowing down the leaching of active calcium in the steelmaking slag and in significantly improving carbonation conversion rate. The highest carbonation conversion rate of approximately 50% can be obtained at the optimal conditions of 20 g/L alkali concentration, 2 mL/L liquid-to-solid ratio, and 70 °C reaction temperature. Carbonation reaction time significantly influences the net carbon dioxide sequestration efficiency. According to calculation, carbon dioxide emission of 52.6 kg/t-slag was avoided at a relatively long time of 120 min.
      PubDate: 2018-07-01
      DOI: 10.1007/s40195-017-0694-0
      Issue No: Vol. 31, No. 7 (2018)
       
  • Microstructure, Mechanical Properties and Corrosion Behavior of Extruded
           Mg–Zn–Ag Alloys with Single-Phase Structure
    • Authors: Hong Zhao; Li-Qing Wang; Yu-Ping Ren; Bo Yang; Song Li; Gao-Wu Qin
      Pages: 575 - 583
      Abstract: Mg–Zn–Ag alloys have been extensively studied in recent years for potential biodegradable implants due to their unique mechanical properties, biodegradability and biocompatibility. In the present study, Mg–3Zn-xAg (wt%, x = 0.2, 0.5 and 0.8) alloys with single-phase crystal structure were prepared by backward extrusion at 340 °C. The addition of Ag element into Mg–3Zn slightly influences the ultimate tensile strength and microstructure, but the elongation firstly increases from 12% to 19.8% and then decreases from 19.8% to 9.9% with the increment of Ag concentration. The tensile yield strength, ultimate tensile strength and elongation of Mg–3Zn–0.2Ag alloy reach up to 142, 234 MPa and 19.8%, respectively, which are the best mechanical performance of Mg–Zn–Ag alloys in the present work. The extruded Mg–3Zn–0.2Ag alloy also possesses the best corrosion behavior with the corresponding corrosion rate of 3.2 mm/year in immersion test, which could be explained by the single-phase and uniformly distributed grain structure, and the fewer twinning.
      PubDate: 2018-06-01
      DOI: 10.1007/s40195-018-0712-x
      Issue No: Vol. 31, No. 6 (2018)
       
  • Effect of Pre-cold Rolling-Induced Twins and Subsequent Precipitated
           ω-Phase on Mechanical Properties in a β-Type Ti–Mo Alloy
    • Authors: Li Xiang; Xiao-Hua Min; Xin Ji; Satoshi Emura; Cong-Qian Cheng; Koichi Tsuchiya
      Pages: 604 - 614
      Abstract: This paper reported an effectiveness of pre-cold rolling-induced {332} < 113 > twins combined with subsequent isothermal ω-phase formation for enhancement of uniform elongation in a β-type Ti–15Mo alloy with high yield strength level. Mechanical {332} < 113 > twins were induced by cold rolling with an thickness reduction of 5%, which had little effect on ω-phase precipitation after aging at 573 K for 3.6 ks. Twinning after the cold rolling was further activated during tensile deformation, even with the presence of isothermal ω-phase. This combination of twins and ω-phase enhanced uniform elongation from 0 to 9% at yield strength level of 890 MPa. The high yield strength was mainly dominated by dislocation slip due to the isothermal ω-phase formation, and early onset of plastic instability after yielding was hindered due to the pre-cold rolling-induced twins. Dynamic microstructural refinement was induced by further twinning activation during deformation, which resulted in high work hardening rate corresponding enhancement of uniform elongation.
      PubDate: 2018-06-01
      DOI: 10.1007/s40195-017-0687-z
      Issue No: Vol. 31, No. 6 (2018)
       
  • Morphological Evolution of Fe-Rich Phases in the AlSi 9 Cu 3 Mg 0.19 (Fe)
           Alloy with the Addition of Minor Mn and Cr
    • Authors: Zhi-Qiang Qiu; Xiang-Chen Meng; Qiu-Hong Yuan; Xiao-Shu Zeng; Xi-Xin Rao; Yan Ding; Lan Luo; Yong Liu
      Pages: 629 - 640
      Abstract: The morphological evolution of Fe-rich phases in the AlSi9Cu3Mg0.19(Fe) alloy has been investigated with various contents of Fe, Mn, and Cr. The results show that coarse Chinese script Fe-rich phases appear in the alloy with 0.6 wt% Fe combined with trace Mn, while the blocky Fe-rich phases appear combined with trace Cr. Under the coexistence of trace Mn and Cr, a large number of fine Chinese script Fe-rich phases could be visible in the low iron-bearing AlSi9Cu3Mg0.19(Fe) alloy (0.60 wt%). At high Fe level (1.30 wt%), numerous Fe-rich phases with hexagonal morphologies are observed with the trace Cr, while fish-bone and pentagonal morphologies of Fe-rich phases could be simultaneously observed with the addition of both Mn and Cr. The results reveal that the trace Mn and Cr promote the morphological evolution of Fe-rich phases. The morphology evolution mechanism of Fe-rich phases has been discussed by using the atom radius and electronegativity differences of Fe, Mn, and Cr.
      PubDate: 2018-06-01
      DOI: 10.1007/s40195-017-0688-y
      Issue No: Vol. 31, No. 6 (2018)
       
  • Shear Model of Metal Melt Flowing on Vibration Wall and Effect of Shear
           Stress on Solidification Microstructure
    • Authors: Ren-Guo Guan; Xiang Wang; Ying-Qiu Shang; Di Tie; Run-Ze Chao
      Pages: 650 - 658
      Abstract: In this work, the shear model of metal melt flowing on vibration surface is established, and coupling effects of vibration and shear on the distribution of shear stress in melt and melt solidification microstructure are analyzed. Calculation results show that the transition of melt from laminar flow to turbulent flow occurs earlier with increasing vibration frequency and vibration amplitude. In the laminar flow melt, shear stress in melt decreases with increasing vertical length, but it decreases firstly and then stabilizes with increasing flow length. In the turbulent flow melt, shear stress decreases firstly and then stabilizes with increasing vertical length, but it increases with increasing flow length. With the increase in vibration frequency and amplitude, shear stress along flow direction in laminar flow melt increases, while shear stresses along both flow direction and vertical direction in turbulent flow melt increase. Shear stress in melt decreases with increasing length along vertical direction. With the increase in flow length, shear stress decreases firstly and then stabilizes in laminar flow melt, while it increases in turbulent flow melt. With the increase in vibration frequency and amplitude, shear stress increases in laminar flow melt, while it stabilizes in turbulent flow melt. Based on theoretical calculation, the maximum shear stress in melt during vibration shear flow is always much lower than the yield strength of α-Al grain, so the shear stress induced by vibration shear flow cannot break columnar crystal, which agrees with the experiment result. So, the model can explain the shear constitutive relation of melt flow on vibration surface relatively well.
      PubDate: 2018-06-01
      DOI: 10.1007/s40195-017-0690-4
      Issue No: Vol. 31, No. 6 (2018)
       
  • Quantitative Analysis of the Crystallographic Orientation Relationship
           Between the Martensite and Austenite in
           Quenching–Partitioning–Tempering Steels
    • Authors: Ke Zhang; Ping Liu; Wei Li; Feng-Cang Ma; Yong-Hua Rong
      Pages: 659 - 667
      Abstract: The orientation relationships (ORs) between the martensite and the retained austenite in low- and medium-carbon steels after quenching–partitioning–tempering process were studied in this work. The ORs in the studied steels are identified by selected-area electron diffraction (SAED) as either K–S or N–W ORs. Meanwhile, the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto. The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure, which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions. However, the simulated results coincide well with experimental pole figures in the high-index directions {123}bcc. A modified method with simplicity based on Miyamoto’s work was proposed. The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’ method, that is, the OR is near K–S OR for the low-carbon Q–P–T steel, and with the increase of carbon content, the OR is closer to N–W OR in medium-carbon Q–P–T steel.
      PubDate: 2018-06-01
      DOI: 10.1007/s40195-017-0683-3
      Issue No: Vol. 31, No. 6 (2018)
       
  • Ni-Based Metallic Glass Composites Containing Cu-Rich Crystalline
           Nanospheres
    • Authors: Yao-Yao Xi; Jie He; Xiao-Jun Sun; Wang Li; Jiu-Zhou Zhao; Hong-Ri Hao; Ting Xiong
      Abstract: In this work, a quaternary Ni–Cu–Nb–Ta system has been designed to obtain composite microstructure with spherical crystalline Cu-rich particles embedded in amorphous Ni-rich matrix. The alloy samples were prepared by using single-roller melting-spinning method. The microstructure and thermal properties of the as-quenched alloy samples were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and differential scanning calorimetry. It shows that the spherical crystalline Cu-rich particles are embedded in the amorphous Ni-rich matrix. The average size of the Cu-rich particles is strongly dependent upon the Cu content. The effect of the alloy composition on the behavior of liquid–liquid phase separation and microstructure evolution was discussed. The phase formation in the Ni-based metallic glass matrix composite was analyzed.
      PubDate: 2018-06-09
      DOI: 10.1007/s40195-018-0756-y
       
  • Mathematical modeling of nanodispersed hardening of FCC materials
    • Authors: Oleg Matvienko; Olga Daneyko; Tatyana Kovalevskaya
      Abstract: The plastic deformation of the pipe made of Cu-based alloy hardened by incoherent nanoparticles and subjected to the uniform internal pressure was investigated. The limits of elastic and plastic resistance are determined. The insignificant excess in the limit of the elastic resistance enables the plastic deformation in the most part of the pipe wall. The densities of shear-forming dislocations and prismatic dislocation loops are higher in alloys strengthened with coarse particles than in alloys strengthened with fine particles. At small distances between the strengthening particles, this effect is the most pronounced.
      PubDate: 2018-06-09
      DOI: 10.1007/s40195-018-0754-0
       
  • CO Catalytic Oxidation of Pt-Loaded Perovskite BaTiO 3 Near
           Ferroelectric-Phase Transition Temperature
    • Authors: Si-Min Yin; Jia-Jie Duanmu; Yong-Feng Yuan; Shao-Yi Guo; Zhi-Chao Zhu; Zhao-Hui Ren; Gao-Rong Han
      Abstract: Perovskite BaTiO3 (BTO) nanocrystals with a size of 150–200 nm have successfully been synthesized via a facile hydrothermal method by employing titanate nanowires as synthetic precursor. Tetragonality and spontaneous ferroelectric polarization of BTO nanocrystals have been determined by X-ray diffraction and transmission electron microscopy investigations. BTO nanocrystals loaded with Pt nanoparticles in a size of 2–5 nm have been explored as a catalyst towards CO oxidation to CO2. It is interesting to find that CO catalytic conversion rate over Pt-BTO nanocrystals gradually decreased and further increased near 100 °C when the catalytic temperature keeps increasing, whereas the conversion behavior in oxides is expected to be enhanced upon the catalytic temperature grows. Using differential scanning calorimetry and first-principle calculations, the observed catalytic behavior has been discussed on the basis of the ferroelectric polarization effect and the ferroelectric–paraelectric transition of BTO nanocrystals with a Curie temperature of ~ 110 °C. Below Curie temperature, CO catalytic oxidation could be significantly tailored by ferroelectric polarization of BTO nanocrystals via a promoted dissociation of O2 molecules. The findings suggest that a ferroelectric polarization in perovskite oxides could be an alternative way to modify the CO catalytic oxidation.
      PubDate: 2018-06-08
      DOI: 10.1007/s40195-018-0757-x
       
 
 
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