Constitutive Relationship and Hot Processing Maps of Mg-Gd-Y-Nb-Zr Alloy

作     者：Zhaohui Zhou Qichao Fan Zhihui Xia Aiguo Hao Wenhua Yang Wei Ji Haiqiao Cao Zhaohui Zhou Qichao Fan Zhihui Xia Aiguo Hao Wenhua Yang Wei Ji Haiqiao Cao

作者机构：Institute of Machinery Manufacturing Technology Chinese Academy of Engineering Physics Mianyang 621900 China 

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

年 卷 期：2017年第33卷第7期

页      面：637-644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）] 

主　　题：Magnesium alloy Recrystallization Constitutive model Processing maps Hot deformation 

摘      要：The hot working behavior of Mg-Gd-Y-Nb-Zr alloy was investigated using constitutive model and hot processing maps in this work. Isothermal compression tests were conducted with temperature and strain rate range of 703-773 K and 0.01-5 s^（-1）, respectively. Improved Arrhenius-type equation incorporated with strain compensations was used to predict flow behavior of the alloy, and the predictability was evaluated using correlation coefficient, root mean square error and absolute relative error. Processing maps were constructed at different strains for Mg-Gd-Y-Nb-Zr alloy based on dynamic materials *** processing maps are divided into three domains and the corresponding microstructure evolutions are referred to the forming of straight grain boundaries, twinning, dynamic recrystallization and grain growth. Instability occurred mainly at the strain rate range of 0.3s^（-1）-0.5s^（-1）. The optimum processing domain is mainly at the temperature range of 703-765 K with the strain rate range of 0.01-0.1 s^（-1）.