Stress corrosion cracking behaviors of RE-containing ME21 magnesium alloy processed by equal-channel angular pressing

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英文篇名：Stress corrosion cracking behaviors of RE-containing ME21 magnesium alloy processed by equal-channel angular pressing 作者：Jinghua ; Jiang ; Qiuyuan ; Xie ; Mingshan ; Qiang ; Aibin ; Ma ; Evans-Kwesi ; Taylor ; Yuhua ; Li ; Dan ; Song ; Jianqing ; Chen 英文作者：Jinghua Jiang;Qiuyuan Xie;Mingshan Qiang;Aibin Ma;Evans-Kwesi Taylor;Yuhua Li;Dan Song;Jianqing Chen;College of Mechanics and Materials, Hohai University;Suqian Institute, Hohai University; 英文关键词：Magnesium alloy;;Stress corrosion cracking;;Equal-channel angular pressing;;Corrosion medium;;Fine-grained;;Rare earths 中文刊名：YXTB 英文刊名：稀土学报(英文版) 机构：College of Mechanics and Materials, Hohai University;Suqian Institute, Hohai University; 出版日期：2019-01-15 出版单位：Journal of Rare Earths 年：2019 期：v.37 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) 语种：英文; 页：YXTB201901012 页数：7 CN：01 ISSN：11-2788/TF 分类号：94-100

摘要

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~(-6) s~(-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.
        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~(-6) s~(-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.

引文

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