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论文类型：期刊论文

发表时间：2016-07-08

发表刊物：SCIENTIFIC REPORTS

收录刊物：SCIE、PubMed

卷号：6

页面范围：29471

ISSN号：2045-2322

摘要：Effect of solid solution treatment (T4) on stress corrosion cracking (SCC) behavior of an as-forged Mg-6.7% Zn-1.3% Y-0.6% Zr (in wt.%) alloy has been investigated using slow strain rate tensile (SSRT) testing in 3.5 wt.% NaCl solution. The results demonstrated that the SCC susceptibility index (ISCC) of as-forged samples was 0.95 and its elongation-to-failure (epsilon(f)) was only 1.1%. After T4 treatment, the SCC resistance was remarkably improved. The ISCC and ef values of T4 samples were 0.86 and 3.4%, respectively. Fractography and surface observation indicated that the stress corrosion cracking mode for as-forged samples was dominated by transgranular and partially intergranular morphology, whereas the cracking mode for T4 samples was transgranular. In both cases, the main cracking mechanism was associated with hydrogen embrittlement (HE). Through alleviating the corrosion attack of Mg matrix, the influence of HE on the SCC resistance of T4 samples can be greatly suppressed.