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| 1 | Effect of corrosion product films on the in vitro degradation behavior of Mg-3%Al-1%Zn(in wt%) alloy in Hank's solution显示文摘Through investigating the corrosion behavior of an as-extruded Mg-3 wt%Al-1 wt%Zn(AZ31) alloy in a simulated physiological fluid of Hank's solution, it demonstrates that the corrosion process was dependent on the immersion time. Further analyses revealed that the highest corrosion resistance could be obtained at 24 h due to the formation of a compact layer of corrosion products on the sample surface.With increasing the immersion time to up to 48 h, the thickness of surface films increased gradually but obvious de-bonding of such film from the substrate could take place, resulting in a certain resilience of the overall corrosion resistance. | B.J.Wang D.K.Xu J.H.Dong W.Ke | 2018 | Journal of Materials Science & Technology2018，34，10： | 16 |
| 2 | Corrosion Evolution of Reinforcing Steel in Concrete under Dry/Wet Cyclic Conditions Contaminated with Chloride显示文摘The corrosion evolution of rebar in concrete was monitored by electrochemical impedance spectroscopy(EIS) under dry/wet alternated accelerated corrosion test.Four stages with different dynamic characteristics were observed during the corrosion evolution.They were passive stage,local corrosion controlled by the charge transfer step,accelerated corrosion controlled by the mass transfer step,and constant rate corrosion controlled by the mass transfer step through a barrier layer.X-ray diffraction(XRD) analysis showed that the corrosion product of rebar in mortar was composed of α-FeOOH,γ-FeOOH and Fe 3 O 4.The corrosion mechanisms of all four stages were discussed and the corrosion reactions were proposed according to the corrosion product and corrosion evolution characteristics. | J.Wei X.X.Fu J.H.Dong W.Ke | 2012 | Journal of Materials Science & Technology2012，28，10： | 11 |
| 3 | Influence of grain size on the tensile ductility and deformation modes of rolled Mg–1.02 wt.%Zn alloy显示文摘The influence of grain size on the tensile deformation and ductility for Mg–1.02%Zn(wt.%)alloy was investigated.The uniform elongation is nearly insensitive to the increase of grain size,but the post-uniform elongation is significantly decreased with increasing grain size.The high ductility in the fine-grained samples is due to the lower frequency of twins and increased dynamic recovery from the enhanced activation of prismaticslip. | B.Q.Shi R.S.Chen W.Ke | 2013 | Journal of Magnesium and Alloys2013，1，3： | 11 |
| 4 | Effect of grain refinement on the hydrogen embrittlement of 304 austenitic stainless steel显示文摘The effect of grain size(in the range from 4 μm to 12 μm) on the hydrogen embrittlement(HE) of 304 austenitic stainless steel(ASS) was studied. HE susceptibility result shows that HE resistance increases with grain refinement. Electron backscattered diffraction kernel average misorientation(EBSD-KAM)mapping shows that the strain localization can be mitigated by grain refinement. Hence, strain localization sites which act as highways for hydrogen diffusion and preferred crack initiation sites can be reduced along with grain refinement, leading to a high HE resistance. Meanwhile, grain size shows no influence on the strain induced martensite(SIM) transformation during the hydrogen charging slow strain tensile test(SSRT). Hence, the SIM formed during hydrogen charging SSRT is not responsible for the different HE resistance of 304 ASSs with various grain sizes. Hydrogen diffusion is supposed to be controlled by a competition between short-circuit diffusion along random grain boundary(RGB) and hydrogen trapping at dislocations, leading to a maximum hydrogen diffusion coefficient in the 304 ASS with an average grain size of 8 μm. | Y.H.Fan B.Zhang J.Q.Wang E.-H.Han W.Ke | 2019 | Journal of Materials Science & Technology2019，35，10： | 10 |
| 5 | Short-time Oxidation of Alloy 690 in High-temperature and High-pressure Steam and Water显示文摘The oxidation behavior of alloy 690 exposed to high-temperature and high-pressure steam and water at 280 ℃ for 1 h was investigated by scanning electron microscopy(SEM),atomic force microscopy(AFM) and X-ray photoelectron spectroscopy(XPS).In high-temperature and high-pressure steam,the oxide film is composed of an outermost Ni-rich hydroxides layer,an intermediate layer of hydroxides and oxides enriched in Cr,an inner oxide layer.The film formed in high-temperature water is similar to that in steam,except for missing the Ni-rich hydroxides layer.Samples with different surface finishes(electropolished,mechanically polished,ground,and as-received) were prepared for comparison.A general increase of the oxide thickness with the degree of surface roughness is observed.The equivalent oxide thicknesses lie in the range of 100-200 nm for the as-received samples,150-250 nm for the samples ground to 400# and 10-20 nm for the samples ground to 1500#,mechanically polished,and electropolished. | F.Huang J.Q.Wang E.H.Han W.Ke | 2012 | Journal of Materials Science & Technology2012，28，6： | 9 |
| 6 | Effect of pre-induced twinning on microstructure and tensile ductility in GW92K magnesium alloy during multi-direction forging at decreasing temperature显示文摘Effect of pre-induced twinning on the microstructure evolution and mechanical properties of extruded Mg-9.26Gd-2.08Y-0.36Zr(GW92K)alloy have been investigated during multi-direction forging with large strains at decreasing temperature from 400℃ to 300℃.The results showed that,whether there pre-induced twinning existing in the initial microstructure by pre-deformation or not,a mixed microstructure of residual coarse grains and notably refined grains formed under both conditions,combing with some residual coarse grains with less deformation inside grains and lots of dispersed nano-precipitates distributed along refined grain boundaries.However,a significant improvement with the tensile ductility was obtained by the pre-induced twinning in the former alloy.It was suggested that,the pre-induced twinning largely contributed to the grain refinement and lead to an increase in the ratio of fine grain structure which would be responsible for the better properties.Furthermore,during subsequent forging deformation in the pre-deformed sample,the grain refinement mechanism by gradual grain orientation rotation around the surface section in residual coarse-grains was a little different from that by the macro-shear deformation in the as-extruded condition. | S.Q.Li W.N.Tang R.S.Chen W.Ke | 2014 | Journal of Magnesium and Alloys2014，2，4： | 8 |
| 7 | Atom probe tomographic observation of hydrogen trapping at carbides/ferrite interfaces for a high strength steel显示文摘A three-dimensional atom probe(3 DAP) technique has been used to characterize the hydrogen distribution on carbides for a high strength AISI 4140 steel.Direct evidence of H atoms trapped at the carbide/ferrite interfaces has been revealed by 3 DAP mapping.Hydrogen is mainly trapped on carbide/ferrite interfaces along the grain boundaries.Slow strain rate tensile(SSRT) testing shows that the AISI 4140 steel is highly sensitive to hydrogen embrittlement.The corresponding fractographic morphologies of hydrogen charged specimen exhibit brittle fracture feature.Combined with these results,it is proposed that the hydrogen trapping sites present in the grain boundaries are responsible for the hydrogen-induced intergranular fracture of AISI 4140.The direct observation of hydrogen distribution contributes to a better understanding of the mechanism of hydrogen embrittlement. | Y.F.Jiang B.Zhang Y.Zhou J.Q.Wang E.-H.Han W.Ke | 2018 | Journal of Materials Science & Technology2018，34，8： | 4 |
| 8 | Effect of heat treatment on the microstructures and mechanical properties of the sand-cast Mg-2.7Nd-0.6Zn-0.5Zr alloy显示文摘The tensile testing bars of the Mg-2.7Nd-0.6Zn-0.5Zr(wt.%)alloy were prepared by sand casting.The effect of solution temperature and aging time on the microstructures and mechanical properties were investigated.The as-cast alloy was composed ofαmagnesium matrix and Mg12Nd eutectic compounds.After solution treatment at 500℃ for 18 h,the volume fraction of eutectic compounds decreased from∼7.8%to∼2.3%,and some small Zr-containing particles were observed to precipitate at grain interiors.As the solution temperature increased to 525℃ for 14 h,most of the eutectic compounds dissolved into the matrix.Peak-aged at 200℃ for 12 h,fineβ″particles was the dominant strengthening phase.The yield strength,ultimate tensile strength and elongation in the peak-aged condition were 191 MPa,258 MPa and 4.2%,respectively.Moreover,the Mg-2.7Nd-0.6Zn-0.5Zr alloys under different heat treatment conditions exhibited different tensile fracture modes. | D.Wu Y.Q.Ma R.S.Chen W.Ke | 2014 | Journal of Magnesium and Alloys2014，2，1： | 4 |
| 9 | High cycle fatigue behavior of the forged Mg-7Gd-5Y-1Nd-0.5Zr alloy显示文摘This paper investigated the high cycle fatigue behavior of a forged Mg-7Gd-5Y-1Nd-0.5Zr alloy with different stress concentration factor(Kt),under different stress ratio(R),and along different loading direction.The smooth specimen(Kt=1),under R=0.1 and along longitude direction,shows a high fatigue strength of 162 MPa at 107 cycles.The fatigue behavior of the forged Mg-7Gd-5Y-1Nd-0.5Zr alloy exhibits a high sensitive to the notch.Moreover,change of stress ratio from 0.1 to−1 may also result in a bad fatigue property.The flux inclusions were elongated along longitude direction and/or transverse direction during the forging process of the Mg-7Gd-5Y-1Nd-0.5Zr alloy.The interface between the flux inclusion and the matrix may debond and serve as the crack initiation site during the fatigue loading process,leading to the deterioration of the fatigue property along thickness direction and a high anisotropic fatigue behavior between longitude direction and thickness direction. | D.Wu S.Q.Li M.Hong R.S.Chen E.H.Han W.Ke | 2014 | Journal of Magnesium and Alloys2014，2，4： | 0 |
| 10 | INVESTIGATION OF INFLUENCE OF HYDROGEN ATTACK ONFATIGUE PROPERTIES OF PRESSURE VESSEL STEELS显示文摘Influence of hydrogen attack on mechanical and fatigue properties of 1020, 15CrMo and 2.25Cr-1Mo steels has been studied, which were exposed to gaseous hydrogen at pressure of 18MPa and 300-480℃ for up to 480h. The results of fatigue test showed that hydrogen attack (HA) resulted in an obvious change in fatigue properties of 1020 and 15CrMo steels, however, 2.25Cr-1Mo steel showed a lower susceptibility to hydrogen attack due to the addition of Cr and Mo. Fatigue crack behaviour for 1020 steel is attributed to hydrogen attack damage and the crack closure induced by the rough cracking surface, which lead to a valley on △Kth~HA% plot. The change in the fatigue behaviour of 15CrMo steel is possibly caused by severe surface decarburization. | J.L.Li K.F.Wang J.Li Z.M.Yao W.Ke | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，2： | 0 |
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