Construction of an Arrhenius constitutive model for Mg-Y-Nd-Zr-Gd rare earth magnesium alloy based on the Zener-Hollomon parameter and objective evaluation of its accuracy in the twinning-rich intervals  

作　　者：Luyi Han Xiangjian Zhu Dejin Wei Yanan Yu Guangchun Wang 

机构地区：[1]Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education),Shandong University,Jinan,Shandong 250061,PR China

出　　处：《Journal of Magnesium and Alloys》2024年第7期2890-2908,共19页镁合金学报（英文）

基　　金：support of the Key Research and Development Program of Shandong Province of China(grant no.2021ZLGX01);Shandong Provincial Key Research and Development Program(Major Scientific and Technological Innovation Project),China(grant no.2021CXGC010206).

摘　　要：According to a high-temperature compression test of rare earth magnesium alloy(WE43),a strain-compensated constitutive model of the Arrhenius equation based on Zener-Hollomon parameters was established,and the rheological behaviors were predicted.The model exhibited relatively serious prediction distortion in the low-temperature and high-strain rate parameter interval,and its accuracy was still unsatisfactory even after modification by a correction operator considering the coupling of temperature and strain rate.The microstructure characterization and statistical analysis showed that a large number of twinning occurred in the parameter intervals with prediction deviation.The occurrence of twinning complicated the local internal stress distribution by drastically changing the crystal orientation and led to significant fluctuations in the macroscopic strain-stress and hardening curves relative to the rheological processes dominated by the dislocation and softening mechanisms,making the logarithm of the strain rate and stress deviate from the linear relationship.This twinning phenomenon was greatly influenced by the temperature and strain rate.Herein,the influence mechanism on twinning behavior was analyzed from the perspective of the interaction of dislocation and twinning.

关 键 词：RE magnesium alloy Hot deformation Zener-Hollomon parameters Arrhenius constitutive model DISLOCATION TWINNING 

分 类 号：TG146.22[一般工业技术—材料科学与工程]