Stress corrosion cracking susceptibility of a high strength Mg-7%Gd-5%Y-1%Nd-0.5%Zr alloy  

作　　者：S.D.Wang D.K.Xu E.H.Han C.Dong 

机构地区：[1]Laboratory of Materials Modification by Laser,Electron and Ion Beams,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China [2]Environmental Corrosion Center,Institute of Metal Research,Chinese Academy of Sciences,62 Wencui Road,Shenyang 110016,China

出　　处：《Journal of Magnesium and Alloys》2014年第4期335-341,共7页镁合金学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China projects under Grant Nos.51171192,51271183 and 51301172,the National Basic Research Program of China(973 Program)project under Grant No.2013CB632205 and the Innovation Fund of Institute of Metal Research(IMR),Chinese Academy of Sciences(CAS).

摘　　要：Through performing the tensile tests with different strain rates in 3.5 wt.%NaCl solution,the stress corrosion cracking(SCC)behavior and the effect of strain rate on the SCC susceptibility of an extruded Mg-7%Gd-5%Y-1%Nd-0.5%Zr(EW75)alloy have been investigated.Results demonstrate that the alloy is susceptible to SCC when the strain rate is lower than 5×10^(−6) s^(−1).At the strain rate of 1×10^(−6) s^(−1),the SCC susceptibility index(I_(SCC))is 0.96 and the elongation-to-failure(ε_(f))is only 0.11%.Fractography indicates that the brittle quasi-cleavage feature is very obvious and become more pronounced with decreasing the strain rate.Further analysis confirms that the cracking mode is predominantly transgranular,but the partial intergranular cracking at some localized area can also occur.Meanwhile,it seems that the crack propagation path is unrelated to the existing phase particles.

关 键 词：Magnesium alloy Stress corrosion cracking Strain rate Pitting corrosion 

分 类 号：TG1[金属学及工艺—金属学]