Corrosion behavior of Mg-3Gd-1Zn-0.4Zr alloy with and without stacking faults

作     者：Xiaobo Zhang Jianwei Dai Ruifeng Zhang Zhixin Ba Nick Birbilis 

作者机构：Jiangsu Key Laboratory of Advanced Structural Materials and Application TechnologySchool of Materials Science and EngineeringNanjing Institute of TechnologyNanjing 211167China School of Materials Science and EngineeringCentral South UniversityChangsha 410083China College of Engineering and Computer ScienceAustralian National UniversityActon ACT 2000Australia 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2019年第7卷第2期

页      面：240-248页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：This project was supported by the Natural Science Foundation of Jiangsu Province for Outstanding Youth(BK20160081) the Natural Science Foundation of Higher Education Institutions of Jiangsu Province-Key Project(18KJA430008) the Jiangsu Government Scholarship for Overseas Studies,the“333 Project”of Jiangsu Province(BRA2018338) the National Natural Science Foundation of China(51701093) the Outstanding Scientific and Technological Innovation Team in Colleges and Universities of Jiangsu Province 

主　　题：Magnesium alloys Stacking faults Corrosion resistance Uniform corrosion 

摘      要：To develop biodegradable magnesium alloy with desirable corrosion properties,a low Gd-containing Mg-3Gd-1Zn-0.4Zr(wt%,GZ31K)alloy was *** as-cast ingot was solution treated and then hot *** were characterized by scanning electron microscopy(SEM).Corrosion behavior of the alloy under each condition was studied by hydrogen evolution and quasi in-situ corrosion *** has been found that the as-cast alloy is composed ofα-Mg,stacking faults(SFs)at the outer edge of the matrix grains,and eutectic phase along the grain *** solution treatment,the SFs disappear and precipitates rich in Zn and Zr elements form in the grain interior and *** microstructure is significantly refined after *** evolution tests show that the as-cast alloy exhibits the best corrosion resistance,and the solution-treated alloy has the worst corrosion *** rate of the alloy under each condition decreases first and then increases with prolonging immersion *** experiments demonstrate thatα-Mg was corroded preferentially,the eutectic phase and precipitates exhibit better corrosion *** as-extruded alloy demonstrates uniform corrosion due to fine and homogeneous microstructure.