Mechanical Behavior and Microstructure Evolution of a Rolled Magnesium Alloy AZ31B Under Low Stress Triaxiality

作     者：Hongchen Pan Fenghua Wang Li Jin Miaolin Feng Jie Dong 

作者机构：National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Department of Engineering MechanicsShanghai Jiao Tong University 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2016年第32卷第12期

页      面：1282-1288页

核心收录：

学科分类：080503[工学-材料加工工程] 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）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：financially supported by the National Natural Science Foundation and Bao Steel of China(Grant No.U1360104) 

主　　题：Magnesium alloy Stress triaxiality Twinning 

摘      要：Plastic deformation up to final rupture failure of a rolled magnesium（Mg） alloy Mg-3.0Al-1.0Zn-0.34Mn（AZ31B） under low stress triaxiality was *** strain evolution was quantified by the digital image correlation（DIC） technique analysis with tensile,combined tensile-shear,and shear specimens,corresponding to the stress triaxiality of 1/3,1/6 and 0,***-strain curves show that the yield stress reduces with the decrease in the stress triaxiality,and obviously exhibits different strain hardening *** backscatter diffraction（EBSD） observations reveal that the twinning behavior depends on stress *** fracture,double twinning is the dominant mechanism at the stress triaxiality of 1/3,while extension twinning is prevalent at the stress triaxiality of ***,scanning electron microscopy（SEM） shows that the fracture mechanism is transformed from microvoid growth and coalescence to internal void shearing as the stress triaxiality decreases from 1/3 to 0.