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 Acta Metallurgica Sinica (English Letters)   [SJR: 0.525]   [H-I: 18]   [5 followers]  Follow         Hybrid journal (It can contain Open Access articles)    ISSN (Print) 1006-7191 - ISSN (Online) 2194-1289    Published by Springer-Verlag  [2355 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
Abstract: 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: 2018-01-13
DOI: 10.1007/s40195-017-0695-z

• 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
Abstract: 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: 2018-01-04
DOI: 10.1007/s40195-017-0694-0

• Temperature-Dependent SRS Behavior of 316L and Its Constitutive Model
• Authors: Jian Peng; Jian Peng; Kai-Shang Li; Jun-Feng Pei; Chang-Yu Zhou
Abstract: Abstract The strain rate sensitivity (SRS) and temperature sensitivity (TS) of 316L austenitic stainless steel were investigated by constant strain rate test (CSRT) and strain rate jump test (SRJT) under four temperatures (293, 373, 473 and 573 K) and four strain rates (5 × 10−4/s, 1 × 10−3/s, 5 × 10−3/s and 1 × 10−2/s). The results show that temperature sensitivity (TS) indexes at different strain rates are coincidence to be negative, related to temperature softening. On the contrary, SRS indexes change from positive to negative with the increase in temperature associated with dynamic strain aging (DSA). Moreover, based on the comparison between CSRT and SRJT, SRS and TS indexes obtained by two methods agree well. It proves that the SRJT can describe the SRS and TS phenomenon of 316L efficiently. Furthermore, the effects of temperature and strain rate on fracture mechanism were discussed. At last, an improved Johnson–Cook model was proposed to consider the temperature-dependent SRS behavior of 316L.
PubDate: 2018-01-03
DOI: 10.1007/s40195-017-0697-x

• Fabrication, Pore Structures and Mechanical Properties of (TiB 2 –Al 2 O
3 )/NiAl Porous Composites
• Authors: Jie Wu; Zhao-Tai Yang; Hong-Zhi Cui; Na Wei; Xiao-Jie Song
Pages: 1145 - 1154
Abstract: Abstract Open-celled porous (TiB2–Al2O3)/NiAl composites were successfully fabricated by using spherical carbamide as space holders via self-propagating high-temperature synthesis (SHS). Effects of 10Al–3B2O3–3TiO2 contents (0–20 wt%) on the pore structures and the quasi-static compressive behaviors of the resultant materials were investigated. The porous (TiB2–Al2O3)/NiAl composites exhibit composite pore structure consisting of homogeneously distributed and interconnected millimeter pores and micropores. The millimeter pores virtually inherit the shape and size of carbamide particles, while the pore size of micropores increases with increasing the 10Al–3B2O3–3TiO2 content. Depending on the volume fraction of the carbamide, the porosity of the porous materials can be easily controlled in a range of 55%–85%. When the porosity is about 72%, the compressive strengths of porous NiAl and porous (TiB2–Al2O3)/NiAl composite with 15% 10Al–3B2O3–3TiO2 in green compact are 19 and 32 MPa, and the corresponding strains are 2.9% and 5.7%, respectively. Furthermore, the quasi-static compressive behavior of porous (TiB2–Al2O3)/NiAl composites can be estimated by Gibson–Ashby model.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0650-z
Issue No: Vol. 30, No. 12 (2017)

• Microstructural Evolution and Softening Behavior of Simulated
Heat-Affected Zone in 2219 Aluminum Alloy
• Authors: Xin-Jie Di; Hui-Juan Xie; Cui-Xin Chen; Cai-Yan Deng; Dong-Po Wang
Pages: 1177 - 1184
Abstract: Abstract The effect of peak temperature (T p) at 200, 300, 400, 500 and 550 °C on the microstructural evolution and softening behavior of the simulated heat-affected zone (HAZ) was studied in the 2219-T87 alloy by electron-backscatter diffraction, transmission electron microscopy, X-ray diffraction, micro-hardness and micro-tensile tests. The results showed that the grain size in the HAZs at 200–500 °C was comparable, but the number density of the strengthening precipitates (GP zones/θ′) decreased with increasing T p. At a T p of 550 °C, the grain size significantly decreased and the distribution of the misorientation angles corresponded to the MacKenzie distribution. The GP zones/θ′ phase coarsened and translated into θ phases at T p values in the range of 200–400 °C. Increasing the T p to 500 °C and above, some θ′ phases translated into θ phases and others dissolved into the α-Al matrix which led to an increase in the solid solution strengthening. The reduction of the number density of the GP zones/θ′ was responsible for the softening behavior.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0586-3
Issue No: Vol. 30, No. 12 (2017)

• Microstructure and Optical Properties of Ti 54.5 Ni 45.5 Nanocrystalline
Thin Film
• Authors: Xin Zhang; Jie-He Sui; Yong-Chao Lei; Wei Cai
Pages: 1231 - 1235
Abstract: Abstract Nanocrystalline Ti54.5Ni45.5 thin film was prepared by magnetron sputtering followed by rapid thermal annealing. The film displayed martensite structure and (001) compound twin substructure, and the transformation temperatures M s and A s are 313 and 365 K, respectively. The reflectivity for the wavelength from 200 to 800 nm at 298 and 393 K was investigated, and the results showed that the optical reflectivity contrast between martensite and austensite at 780, 650, 514 and 405 nm was 105.64, 170.83, 112.22 and 149.92%, respectively, which were larger than those of other reported optical recording materials.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0606-3
Issue No: Vol. 30, No. 12 (2017)

• Enhancement of Photocatalytic and Antibacterial Activities of ZnO:Ag
Nanopowders Through the Addition of Bamboo Charcoal: An Efficient Natural
• Authors: K. Nithiyadevi; K. Ravichandran
Pages: 1249 - 1256
Abstract: Abstract This research article explains the removal of methylene blue (MB) and malachite green (MG) from aqueous solution using adsorption/photodegradation activity of ZnO:Ag/bamboo charcoal (BC) nanocomposite. In addition, the antibacterial studies of the prepared samples were tested against Staphylococcus aureus (S. aureus) Gram-positive and Escherichia coli (E. coli) Gram-negative bacteria by the well diffusion method. The ZnO:Ag/BC nanocomposite exhibits superior photocatalytic activity compared with ZnO:Ag. Remarkable degradation efficiencies of 93.95% (MB) and 95.75% (MG) were recorded for ZnO:Ag/BC nanocomposite after 45 min. The degradation process follows a pseudo-first-order kinetics. The rate constant of ZnO:Ag/BC nanocomposite is two times greater than that of pristine ZnO nanopowder for the degradation of MB dye, while for MG dye degradation, it is three times. It is found that the ZnO:Ag/BC nanocomposite shows a higher rate of dye removal due to excellent adsorbing properties of bamboo charcoal (BC). The ZnO:Ag/BC nanocomposite showed better antibacterial properties compared to ZnO:Ag. In this study, the samples were prepared using a simple and low-cost soft chemical route and they were characterized by optical, structural, surface morphological, antibacterial and photocatalytic properties. These characterization studies substantiate the discussions on the photocatalytic and antibacterial activities of the synthesized samples.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0618-z
Issue No: Vol. 30, No. 12 (2017)

• 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
Abstract: 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: 2017-12-29
DOI: 10.1007/s40195-017-0698-9

• 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
Abstract: 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: 2017-12-28
DOI: 10.1007/s40195-017-0699-8

• Interpretation of the Habit Plane of δ Precipitates in Superalloy
Inconel 718
• Authors: Wen-Sheng Xu; Xiao-Peng Yang; Wen-Zheng Zhang
Abstract: Abstract A calculation method based on a combination of ∆ g parallelism rule, good matching site (GMS) analysis, CSL/DSCL (coincidence site lattice/displacement shift complete lattice) and the O-lattice theory has been applied to interpret the observation of the habit plane (HP) of the δ precipitates and the linear defects in the HP in an Inconel 718 superalloy. The small scattering in the HP orientation around an ideal rational plane is interpreted by the existence of a mixture of two types of steps with different heights and inclinations. These steps play a significant role to enhance the degree of matching in the HP. They are associated with secondary dislocations, with Burgers vectors of $$1/6\left[ {1\;1\;\bar{2}} \right]_{\gamma } / 1/3[0\;0\;1]_{\delta }$$ , and with a direction parallel to a near-invariant line along $$[1\;\bar{1}\;0]_{\gamma }$$ . The spacing of the secondary dislocations projected on the terrace plane is around 6.3 nm. The calculated dislocation structure is in good agreement with the observation.
PubDate: 2017-12-19
DOI: 10.1007/s40195-017-0693-1

• 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
Abstract: 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: 2017-12-18
DOI: 10.1007/s40195-017-0690-4

• 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
Abstract: 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: 2017-12-15
DOI: 10.1007/s40195-017-0687-z

• 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
Abstract: 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: 2017-12-15
DOI: 10.1007/s40195-017-0691-3

• Effects of γ-Ray Irradiation on the Fatigue Strength, Thermal
Conductivities and Thermal Stabilities of the Glass Fibres/Epoxy Resins
Composites
• Authors: Li-Fang Zheng; Lu-Ning Wang; Zhao-Zhong Wang; Li Wang
Abstract: Abstract Glass fibres/epoxy resins composites have been performed as ideal materials to make support instruments for high-energy and nuclear physics experiments. The effects of the γ-ray irradiation on the fatigue strength, thermal conductivities and thermal stabilities of the glass fibres/epoxy resins composites were investigated. And a two-parameter fatigue life model was established to predict the fatigue life of the composites. Results revealed that the γ-ray irradiation could probably result in the degradation of epoxy resins, but hardly damage to the glass fibres. And the γ-ray irradiation treatment could significantly affect the fatigue strength of the composites at a low-cycle fatigue stage, but seldom influence at a high-cycle fatigue stage. Furthermore, the fabricated glass fibres/epoxy resins composites after the γ-ray irradiation still presented excellent fatigue strength, ideal thermal conductivities, remarkable dimensional and thermal stabilities, which can meet the actual requirements of normal operation for supporting instruments under high-energy and nuclear physics experiments.
PubDate: 2017-12-13
DOI: 10.1007/s40195-017-0692-2

• 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
Abstract: 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: 2017-12-13
DOI: 10.1007/s40195-017-0688-y

• Thermal Properties of Mg–Al/AlN Composites Fabricated by Powder
Metallurgy
• Authors: Jie Chen; Chong-Gao Bao; Zhi-Wei Liu; Ben-Shuang Sun; Yong-Chun Shu; Qing-Kui Li
Abstract: Abstract Magnesium matrix composites reinforced with AlN particles were fabricated by the powder metallurgy technique. Different mixing methods were used in this study to control the distribution of AlN particles. The microstructure, thermal diffusivity and thermal expansion of the Mg–Al/AlN composites using different mixing methods were investigated. The results showed that the intergranular and intragranular distributions of AlN particles were obtained, respectively, by controlling the mixing methods. The composite with intragranular particles exhibited lower thermal diffusivity because of the existences of more interfaces, defects and grain boundaries, which acted as scattering centers and reduced the mean free path of electrons and phonons. The existence of AlN particles lowered the coefficient of thermal expansion (CTE) and enhanced the dimensional stability of the composites. And the use of the improved mixing method further reduced the CTE of Mg–Al/AlN composites.
PubDate: 2017-12-13
DOI: 10.1007/s40195-017-0689-x

• Fast Degradation of Green Pollutants Through Nanonets and Nanofibers of
the Al-Doped Zinc Oxide
• Authors: Osama Saber; Haifa Alomair; Mohamed Abu-Abdeen; Abdullah Aljaafari
Abstract: Abstract In this study, series of nanolayered structures of Zn–Al LDHs were prepared by urea hydrolysis. Nanofibers and nanonets of the Al-doped ZnO were formed via the decomposition of the nanolayers under high pressure and temperature. Nanospheres were also prepared for comparison. The different morphologies of the prepared nanomaterials were confirmed by several techniques. An improvement for the optical properties of the doped zinc oxides was observed through narrowing of their band gap energies because of transforming the nanolayers to nanonets and nanofibers. The photocatalytic activities of the prepared nanomaterials were studied through photocatalytic degradation of the pollutants of acid green dyes. Complete decolorization and mineralization of green dyes happened in the presence of the nanolayers and nanospheres within 4–6 h, while the nanonets and the nanofibers achieved the complete decolorization and degradation of the dyes at shorter time 1.3 h. These results could be explained though the kinetic study of the photocatalytic degradation of dyes. It was concluded that the nanonets and the nanofibers were very effective for the photocatalytic degradation of pollutants.
PubDate: 2017-12-13
DOI: 10.1007/s40195-017-0682-4

• Solidification of Pb–Al Alloys Under the Influence of Electric
Current Pulses
• Authors: Tauseef Ahmed; Hong-Xiang Jiang; Wang Li; Jiu-Zhou Zhao
Abstract: Abstract Continuous solidification experiments are carried out with Pb–Al alloys under the influence of the electric current pulses (ECPs). The results demonstrate that the ECPs mainly affect the microstructure formation through changing the energy barrier for the nucleation of the minority phase droplets (MPDs) and minority phase particles (MPPs) during cooling Pb–Al alloys in the liquid–liquid and liquid–solid phase transformation temperature ranges in advance of the solidification of the matrix liquid. For Pb–Al alloys with Al-rich droplets/particles as the minority phase, the ECPs lower the energy barriers for the nucleation of the MPDs/MPPs and cause a significant increase in the nucleation rate of the MPDs/MPPs and, thus, promote the formation of Pb–Al alloys with a well-dispersed or even nanoparticles dispersed microstructure. The ECPs parameters show an important influence on the microstructure formation of Pb–Al alloys. The refinement extent of the MPDs/MPPs increases with the increase in the peak current density. For a given peak current density, the refinement extent of the MPDs/MPPs increases with the increases in the pulse frequency and pulse width first, and then level off and become asymptotic.
PubDate: 2017-12-07
DOI: 10.1007/s40195-017-0685-1

• 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
Abstract: 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: 2017-12-06
DOI: 10.1007/s40195-017-0683-3

• Structure and Magnetic Properties of Magnetostrictive FeGa Film on
Single-Crystal (100) GaAs and (001) Si Substrate Fabricated by Pulsed
Laser Deposition
• Authors: Y. Zhang; M. Turghun; C. J. Huang; T. Wang; F. F. Wang; W. Z. Shi
Abstract: Abstract FeGa thin film has been deposited on (100)-oriented GaAs and (001)-oriented Si substrates with different film thicknesses and laser energy densities at room temperature by pulsed laser deposition system. Materials structure and static magnetic of FeGa film have great changes depending on the substrate and energy density of pulsed laser. X-ray diffraction reveals the presence of first-order order–disorder structure of D03-ordered grain phase and disordered bcc A2 structure on GaAs substrate. The coercivity and remanence of FeGa film on GaAs substrate ratio show a regular dependence on the thickness and energy densities. However, film on Si substrate did not exhibit structure change, which can be attributed to a large lattice mismatch between FeGa and Si.
PubDate: 2017-12-06
DOI: 10.1007/s40195-017-0686-0

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