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

• Published in: Journal of materials science & technology Vol. 33; no. 7; pp. 637 - 644
• Main Authors: Zhou, Zhaohui, Fan, Qichao, Xia, Zhihui, Hao, Aiguo, Yang, Wenhua, Ji, Wei, Cao, Haiqiao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2017
• Subjects: Constitutive model; Hot deformation; Magnesium alloy; Processing maps; Recrystallization; 合金; 均方根误差; 本构关系; 温度范围; 热加工图; 热加工性能; 等温压缩试验; 阿伦尼乌斯; Hot deformation; Constitutive model; Processing maps; Magnesium alloy; Recrystallization
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/j.jmst.2015.10.019

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 model.The 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）.