Failure mechanism of as-cast Mg-6Zn-2Er alloy during tensile test at room temperature

作     者：刘轲 王庆峰 杜文博 李淑波 王朝辉 Ke LIU;Qing-feng WANG;Wen-bo DU;Shu-bo LI;Zhao-hui WANG

作者机构：北京工业大学材料科学与工程学院北京100124 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2013年第23卷第11期

页      面：3193-3199页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0703[理学-化学] 0814[工学-土木工程] 0702[理学-物理学] 

基　　金：Projects(51071004,51101002)supported by the National Natural Science Foundation of China Project(2011BAE22B01-3)supported by the National Science and Technology Supporting Plan during the 12th Five-Year Period,China 

主　　题：Mg alloy Mg-Zn-Er alloy microstructure mechanical properties W-phase crack plastic deformation 

摘      要：Tensile test of the as-cast Mg-6Zn-2Er alloy was conducted at room temperature. The results indicate that the alloy is inclined to failure when the strain reaches 5.6%. The coarse secondary phases are responsible for the failure, especially for the Mg3Zn3Er2 phase （W-phase）. It is indicated that the existence of the W-phase activates the stress concentrations due to the incapacity of W-phase for the load transfer, which results in the void at the inner of the W-phase. In comparison, the interface between the matrix and the secondary phase is stable. In conclusion, the characters of the secondary phases with respect to size, distribution, morphology and type, play an important role in the plastic deformation behavior of the alloy.