A commercial as-cast ME21 magnesium alloy containing rare-earth （RE） element was processed by equalchannel angular pressing to obtain fine-grained micro structure. Stress corrosion cracking （SCC） behaviors of the fine-grained samples were studied by slow-strain-rate testing in air, distilled water and Hanks’solution at the strain rate of 1×10-6s-1. All samples show a relatively low SCC sensitivity in distilled water but a great SCC tendency in Hanks’ solution. The microscopic observations of the fracture surfaces and the side surfaces reveal obvious active anodic dissolution and hydrogen embrittlement cracks, which indicate the higher SCC susceptibility in Hanks’solution. The fine-grained microstructure with more crystal defects promotes the passivation process of the oxide film and restrains the hydrogen induced cracking of the ME21 magnesium alloy, leading to the higher general corrosion resistance as well as SCC resistance.
类型: 期刊论文
作者: Jinghua Jiang,Qiuyuan Xie,Mingshan Qiang,Aibin Ma,Evans-Kwesi Taylor,Yuhua Li,Dan Song,Jianqing Chen
来源: Journal of Rare Earths 2019年01期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 金属学及金属工艺
单位: College of Mechanics and Materials, Hohai University,Suqian Institute, Hohai University
基金: supported by the Key Research and Development Project of Jiangsu Province of China(BE2017148),the Fundamental Research Funds for the Central Universities(HHU2016B10314),Six Major Talent Peaks Project of Jiangsu Province of China(2014-XCL-023)
分类号: TG146.22
页码: 88-94
总页数: 7
文件大小: 1817K
下载量: 21
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