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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  [2352 journals]
• 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: 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)

• Effect of Milling Tools on the Microstructure and Property of Cu-Based
Composites Prepared by Mechanical Alloying
• Authors: Ruo-Shan Lei; Ming-Pu Wang
Pages: 1155 - 1162
Abstract: Cu and Nb powders were used as starting materials to produce Cu–Nb and Cu–NbC–WC composites by mechanical alloying. X-ray diffraction, scanning electron microscopy, transmission electron microscopy observations and microhardness measurements have been used to study the effects of milling tools on the phase, microstructure and property of the composites. The results revealed that a single-phase nanocrystalline solid solution was obtained using stainless steel vials and balls (Alloy 1). Nevertheless, Cu–7 wt% Nb powders milled by tungsten carbon vials and balls exhibited an amorphous phase (Alloy 2). The as-milled powders were then vacuum hot-pressing sintered. The microstructure of sintered Alloy 1 consisted of Nb nanoparticles and Cu nanograins. Instead, Alloy 2 showed a microstructure with NbC nanoparticles and WC submicron-sized particles dispersed throughout the Cu matrix. Furthermore, Alloy 2 (~322 HV) had a higher microhardness than Alloy 1 (~302 HV).
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0582-7
Issue No: Vol. 30, No. 12 (2017)

• Dynamic Mechanical Behavior and Hypervelocity Impact Performance of an
Al-Based Nanocrystalline Alloy
• Authors: Shan-Shan Deng; Gang Wang; Run-Qing Chi; Bao-Jun Pang; Dong-Jun Wang; Jun Shen
Pages: 1169 - 1176
Abstract: In a wide strain rate range from 10−5 to 103 s−1, the deformation behavior of an Al-based nanocrystalline alloy was investigated. After fracture, the debris collected was used for statistical analysis, which is expected to reflect the profile of the fracture behavior of the alloy. The energy absorption of alloy at different strain rates was elucidated on account of mass distribution of debris. Based on the parameters obtained by the compression experiment at different strain rates, the numerical simulation experiment was carried out to evaluate the performance of Al-based nanocrystalline alloy as spacecraft shielding. The results suggest that Al-based nanocrystalline alloys have better shield performance than aluminum alloy under the identical areal density at velocity of 1–7 km/s. The better shield performance is attributed to high fracture strength, high hardness and low toughness of Al-based nanocrystalline alloy as compared with those of aluminum alloy.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0644-x
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: 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 Evolution and Growth Orientation of Directionally
Solidified Mg–4 wt% Zn Alloy with Different Growth Rates
• Authors: Hong-Min Jia; Xiao-Hui Feng; Yuan-Sheng Yang
Pages: 1185 - 1191
Abstract: The microstructure evolution and growth orientation of directionally solidified Mg–4 wt% Zn alloy in the growth rate range from 20 to 200 μm/s were investigated. A typical cellular structure was observed with a growth rate of 20 μm/s, and the cellular spacing was 115 μm. When the growth rate increased to 60 μm/s, cellular structure with some developed perturbations was obtained and the cellular spacing was 145 μm, suggesting that the cell-to-dendrite transition happened at the growth rate lower than 60 μm/s. As the growth rate further increased, the microstructure was dendritic and the primary dendritic arm spacing decreased. The relationship between the primary dendritic arm spacings and the growth rates was in good agreement with Trivedi model during dendritic growth. Besides, X-ray diffraction and transmission electron microscopy analyses showed that the growth direction of directionally solidified Mg–4 wt% Zn alloy was $$\left\langle {11\bar{2}0} \right\rangle$$ lay in $$\left\{ {0002} \right\}$$ crystal plane, and the preferred orientation was explained with the lattice vibration model for one-dimensional monatomic chain.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0630-3
Issue No: Vol. 30, No. 12 (2017)

• The Intrinsic Relationship Between Microstructure Evolution and Thermal
Fatigue Behavior of a Single-Crystal Cobalt-Base Superalloy
• Authors: Wei-Min Gui; Hong-Yu Zhang; Min Yang; Tao Jin; Xiao-Feng Sun; Qi Zheng
Pages: 1192 - 1200
Abstract: The intrinsic relationship between the microstructure evolution and thermal fatigue behavior of a single-crystal cobalt-base superalloy has been investigated. The thermal fatigue tests are performed cyclically between room temperature and 1050 °C using V-notch plate specimens. Three states of thermal fatigue specimens are selected: the as-cast, solutionized as well as aged states. The solution treatment is carried out at 1260 °C for 24 h, which results in the dissolution of most of interdendritic continuous primary carbides. The subsequent aging treatment is carried out at 1100 °C for 100 h after solution treatment, resulting in the precipitation of a profusion of chain- and point-like M 23C6 carbides in the matrix. The results indicate that the heat treatment can improve the thermal fatigue properties of the alloy and the effect of the solution treatment is more prominent than that of the aging treatment. The coarse and continuously distributed primary carbides in the as-cast state are changed into small and discontinuous distribution by heat treatment, which is the dominant factor in the improvement of thermal fatigue property. Additionally, the effect of oxidation behavior during thermal fatigue test on the thermal fatigue behavior is also studied.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0646-8
Issue No: Vol. 30, No. 12 (2017)

• Fabrication and Significant Photoelectrochemical Activity of Titania
Nanotubes Modified with Thin Indium Tin Oxide Film
• Authors: Katarzyna Siuzdak; Mariusz Szkoda; Jakub Karczewski; Jacek Ryl; Kazimierz Darowicki; Katarzyna Grochowska
Pages: 1210 - 1220
Abstract: Ordered titanium dioxide nanotubes (TiO2NTs) modified with indium tin oxide (ITO) films were obtained via magnetron sputtering, in which ITO plate was used as a target, onto the as-anodized titania support followed by the calcination process. The morphology of fabricated material with deposited oxide was investigated using scanning electron microscopy. Raman and UV–Vis spectroscopies were utilized to characterize crystalline phase and optical properties of prepared samples, whereas X-ray photoelectron spectroscopy allowed determining the binding energy of present elements. In the case of titanium, three various oxidation states were identified and also the presence of indium and tin was confirmed. The electrochemical test carried out when the sample was exposed to light allows for selection of the most photoactive material. The highest photocurrent was registered when only 5-nm ITO layer was sputtered, and it equals 256 and 133 µA cm−2 for the electrode material immersed in 0.5 M KOH and K2SO4 electrolytes, respectively, that is accordingly 3.5 and 4.4 times higher than the one observed for pristine titania. Furthermore, ITO-modified titania exhibits excellent photostability upon prolonged illumination that is of key importance for possible application in light-driven processes.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0653-9
Issue No: Vol. 30, No. 12 (2017)

• Influence of Al Content on the Microstructure and Properties of the CrAlN
Coatings Deposited by Arc Ion Plating
• Authors: Qi-Xiang Fan; Jiao-Jiao Zhang; Zheng-Huan Wu; Yan-Mei Liu; Tao Zhang; Bing Yan; Tie-Gang Wang
Pages: 1221 - 1230
Abstract: Four CrAlN coatings with various Al content were prepared by arc ion plating technology under different target currents. The effect of the Al content on the microstructure, chemical compositions, element chemical bonding states and mechanical properties of the CrAlN coatings was analyzed. X-ray diffraction results show that the primary phase of the CrAlN coating is fcc-(Al, Cr)N when the Al content is about 44.02 at.%. However, when the Al content increases to about 53.34 at.%, hcp-AlN phase emerges in the coating. And the hcp-AlN phase becomes the main phase in the CrAlN coating with Al content of about 69.55 at.%. Cross-sectional images show that all the four coatings possess dense structures and the deposition rate of Al atom is higher than that of Cr atom. The hardness of the CrAlN coating with Al content about 44.02 at.% is the largest (3149.72 HV) due to the solid solution hardening effect of the Al element. When the hcp-AlN phase is generated in the CrAlN coating, the hardness declines. The tribological experiment shows that the wear resistance of the CrAlN coating decreases gradually with increasing Al content when sliding against 100Cr6 steel ball.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0656-6
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: 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)

• Influence of Aspect Ratio on Giant Magnetoimpedance Effect for Fe 67 Co 18
Si 11 B 4 Amorphous Ribbons
• Authors: Yan-Hong Ding; Ke Xue; Wei-Yan Wang; Xu Ma
Pages: 1236 - 1242
Abstract: The effect of sample geometry aspect ratio (l/w) on the giant magnetoimpedance (GMI) in Fe67Co18Si11B4 amorphous ribbons was investigated systematically. The GMI profiles were measured as a function of the external magnetic field at different frequencies up to 110 MHz. The results show that there exists a critical aspect ratio ((l/w)0 = 5.4) below which the maximum GMI effect and sensitivity η decrease with decreasing l/w and above which the maximum GMI effect keeps almost constant and η decreases with increasing l/w. The observed dependence on aspect ratio as (l/w) < (l/w)0 is correlated with the magnetization process: Complex domain structures emerged near the ribbon ends to decrease the magnetostatic energy, modify the transverse permeability and consequently GMI response. Contributions from transverse permeability and resistance may dominantly determine the change of GMI effect as (l/w) > (l/w)0.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0617-0
Issue No: Vol. 30, No. 12 (2017)

• Performance of Ag 2 O/Ag Electrode as Cathodic Electron Acceptor in
Microbial Fuel Cell
• Authors: Hong-Yan Dai; Hui-Min Yang; Xuan Jian; Xian Liu; Zhen-Hai Liang
Pages: 1243 - 1248
Abstract: An Ag2O/Ag electrode was prepared through the electrochemical oxidation of sterling silver. This electrode was used as a cathodic electron acceptor in a microbial fuel cell (MFC). The Ag2O/Ag electrode was characterized by scanning electron microscopy, X-ray powder diffraction and linear sweep voltammetry. The maximum voltage output of the MFC with the Ag2O/Ag cathode was maintained at between 0.47 and 0.5 V in 100 cycles, indicating the good regenerative capacity of the Ag2O/Ag electrode. The overpotential loss for silver oxide was 0.021–0.006 V, and the maximum power output, open circuit potential and short circuit current of the MFC were 1.796 W m−3, 0.559 V and 9.3375 A m−3, respectively. The energy required for electrochemical reoxidation ranged from 40% to 55% of the energy produced by the MFC. Results indicated that the Ag2O/Ag electrode could be used as a cathodic electron acceptor in MFCs with excellent stability.
PubDate: 2017-12-01
DOI: 10.1007/s40195-017-0616-1
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: 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)

• Effect of Heat Treatment on Microstructure and Mechanical Properties of
Quenching and Partitioning Steel
• Authors: Shao-Heng Sun; Ai-Min Zhao; Ran Ding; Xiao-Gang Li
Abstract: In order to investigate the effect of microstructural characterization on the mechanical properties and retained austenite stability, a different type of quenching and partitioning steel (I-Q&P) through intercritical annealing before the quenching and partitioning process was designed, which can realize lamellar intercritical microstructure compared to the conventional quenching and partitioning (Q&P) process. The morphology of ferrite and martensite/retained austenite is lamellar in the I-Q&P steel while it is equiaxed after being heat-treated by conventional Q&P process. The I-Q&P steel is proved to have better formability and mechanical properties than conventional Q&P steel, which is due to the higher-volume fraction of retained austenite in the I-Q&P steel and confirmed by electron backscattering diffraction patterns and X-ray diffraction. Furthermore, the stability of retained austenite in I-Q&P steel is also higher than that in conventional Q&P steel, which is investigated by tensile tests and differential scanning calorimetry.
PubDate: 2017-11-13
DOI: 10.1007/s40195-017-0667-3

• Influence of Initial Microstructure on the Strengthening Effect of
Extruded Mg–8Sn–4Zn–2Al Alloys
• Authors: Yang Bai; Wei-Li Cheng; Shi-Chao Ma; Jun Zhang; Chen Guo; Yao Zhang
Abstract: The Mg–8Sn–4Zn–2Al (TZA842, in wt%) alloys with different initial microstructure (as-cast-AC and homogenization treatment-HT) subjected to hot extrusion. Also, the strengthening responses to AC and HT for the extruded TZA842 alloys were reported. The results revealed that the alloy subjected to HT shows finer grain size, more homogenous microstructure and weaker basal texture than those of counterpart subjected to AC. In addition, compared with TZA842-AC alloy, precipitates were finer and uniformly dispersed in TZA842-HT owing to the utilization of HT. Moreover, the TZA842-HT alloy showed higher yield strength of 200 MPa, ultimate tensile strength of 290 MPa and elongation (EL) of 17.9% than those of TZA842-AC, which was mainly attributed to the combined effects of grain boundary strengthening, precipitation strengthening, solid solution strengthening and weak texture. Strengthening mechanism for both alloys was discussed in detail.
PubDate: 2017-11-09
DOI: 10.1007/s40195-017-0673-5

• Influence of Processing Parameters on Microstructural Evolution and
Tensile Properties for 7075 Al Alloy Prepared by an ECAP-Based SIMA
Process
• Authors: Jin-Long Fu; Hong-Jun Jiang; Kai-Kun Wang
Abstract: A modified strain-induced melt activation (SIMA) process consisting of homogenization, equal-channel angular pressing (ECAP) and subsequent heating to the semisolid temperatures was introduced to prepare the 7075 aluminum alloy with superior thixotropic behaviors. The effects of both the homogenization and the number of ECAP passes, as well as the isothermal temperatures on the microstructural evolution, were investigated. The results indicate that ideal microstructure wherein fine and globular solid grains surrounded by uniform liquid films can be achieved through ECAP deformation–recrystallization mechanism. Increasing the number of ECAP passes accelerates the recrystallization of strained grains, thus reducing the average grain size and improving the grain sphericity. Moreover, higher holding temperatures and prolonged soaking time can improve the growth of the solid grains. Two main coarsening mechanisms, viz. coalescence and Ostwald ripening, contribute to the growth of the solid grains simultaneously and independently. The tensile strength of the 7075 alloys after four-pass ECAP-based SIMA and T6 heat treatment is relatively lower than the as-received billet, while the elongation of SIMA processed samples is much higher than that of as-received ones. Increasing the number of ECAP passes improves the tensile strength for alloys with and without T6 treatment due to the fine grain strengthening mechanism.
PubDate: 2017-11-09
DOI: 10.1007/s40195-017-0672-6

• Gamma-phase influence on shape memory properties in Ni-Mn-Co-Ga-Gd
high-temperature shape memory alloys
• Authors: Wei Zhang; Xin Zhang; Qian Wang; Qing-Suo Liu
Abstract: The effect of γ-phase on two-way shape memory effect (TWSME) of polycrystalline Ni56Mn25-x Co x Ga18.9Gd0.1 alloys was investigated. The results show that an appropriate amount of ductile γ-phase significantly enhances the TWSME. The largest TWSME of 1.4% without training is observed in Ni56Mn21Co4Ga18.9Gd0.1 alloy, and this value is increased to 2.0% after thermomechanical training. The as-trained TWSME decays over the first five thermal cycles and then reaches a stable value as the number of cycles further increasing. Only the degradation of 0.2% is observed after 100 thermal cycles. The better TWSME and thermal stability are ascribed to the stable extra stress field formed by the plastically deformed γ-phase.
PubDate: 2017-11-04
DOI: 10.1007/s40195-017-0675-3

• Energy Density Dependence of Bonding Characteristics of Selective
Laser-Melted Nb–Si-Based Alloy on Titanium Substrate
• Authors: Yue-Ling Guo; Li-Na Jia; Bin Kong; Yong-Lin Huang; Hu Zhang
Abstract: Spherical Nb–20Si–24Ti–2Cr–2Al pre-alloyed powders were processed by selective laser melting (SLM) on Ti6Al4V substrates with different energy densities. A series of single tracks and single layers were produced using different processing parameters, including powder size, laser power, scanning speed and hatch distance. Results showed that the pre-alloyed powders ranging from 45 to 75 μm were more applicable to SLM with less balling tendency, in comparison with those between 75 and 180 μm. The increase in linear energy density (LED) resulted in the decrease in contact angle and the increase in the width of single track as well as its penetration depth into the substrate. Smaller hatch distance leaded to a larger remelted part of the former track and a higher volumetric laser energy density. With a thickness of 75.6 μm, an interfacial intermediate layer, enriched in Ti and depleted in Nb, Si, Cr and Al, was formed between the SLM part and the Ti6Al4V substrate. The mechanisms of the elimination of balling phenomenon by employing a higher LED and the interfacial bonding characteristics between Nb–Si-based alloys via SLM and the Ti6Al4V substrate were discussed.
PubDate: 2017-11-02
DOI: 10.1007/s40195-017-0670-8

• Tribological analysis of the surface layer coated by sintered
serpentine-reinforced composites
• Authors: Xiao Wang; Jun-Wei Wu; Lu-Hai Zhou; Xi-Cheng Wei; Wu-Rong Wang
Abstract: In this work, the serpentine powders were sintered to make the serpentine-reinforced Al-matrix composites, and the microstructures of which were characterized by differential scanning calorimetry, thermal gravimetric analyzer, and X-ray diffractometer. Scanning electron microscopy equipped with energy dispersive spectroscopy. Results show that the sintered serpentine powders were deeply absorbed on the worn surface and embedded in the furrows and scratches of the matrix, forming a self-repairing surface layer which reduces the friction coefficient. The surface layer coated by serpentine was compact, dense, and uniform with the friction time prolonged, compensating the worn loss and increasing the matrix mass.
PubDate: 2017-11-02
DOI: 10.1007/s40195-017-0674-4

• Corrosion Behavior of Cupronickel Alloy in Simulated Seawater in the
Presence of Sulfate-Reducing Bacteria
• Authors: Yanyan Song; Hongwei Shi; Jun Wang; Fuchun Liu; En-Hou Han; Wei Ke; Ganxin Jie; Jun Wang; Haijun Huang
Abstract: The corrosion behavior of cupronickel alloy immersed in the simulated seawater in or without the presence of sulfate-reducing bacteria (SRB) was studied. The results of scanning electronic microscopy and electrochemical impedance spectra reveal that corrosion of the sample immersed in the simulated seawater with SRB was more serious than that immersed in the simulated seawater without SRB. The atomic force microscopy images show that after immersion for 15 days, the surface roughness of the sample in the simulated seawater with SRB was higher than that of the sample in the simulated seawater without SRB. The analysis of confocal laser scanning microscopy indicates that the average depth of the pits on the surface of the sample in the simulated seawater with SRB was almost twice deeper than that of the sample in the simulated seawater without SRB.
PubDate: 2017-10-14
DOI: 10.1007/s40195-017-0662-8

• Effect of HIP Treatment on Fatigue Crack Growth Behavior of Ti–6Al–4V
Alloy Fabricated by Electron Beam Melting
• Authors: Yan Liu; Jun Zhang; Shu-Jun Li; Wen-Tao Hou; Hao Wang; Qin-Si Xu; Yu-Lin Hao; Rui Yang
Abstract: The effect of hot isostatic pressing treatment on the fatigue crack growth behavior of Ti–6Al–4V alloy fabricated by electron beam melting was investigated. The results indicate that the fatigue crack growth rate of the HIPed samples is higher than that of the as-fabricated one under certain stress intensity factor (ΔK < 18 MPa m1/2). With further increase in ΔK, the fatigue crack growth rates of the studied two samples become similar. The variation of α lamella thickness and the pore defects distribution have an effect on the fatigue crack growth rates in the studied samples, and the latter plays the dominant role.
PubDate: 2017-10-13
DOI: 10.1007/s40195-017-0665-5

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