Dynamic recrystallization and deformation constitutive analysis of Mg-Zn-Nd-Zr alloys during hot rolling

Fanxiao Kong; Yanmei Yang; Hao Chen; Haiyan Liu; Chao Fan; Weidong Xie; Guobing Wei

doi:10.1016/j.heliyon.2022.e09995

Dynamic recrystallization and deformation constitutive analysis of Mg-Zn-Nd-Zr alloys during hot rolling

Heliyon. 2022 Jul 19;8(8):e09995. doi: 10.1016/j.heliyon.2022.e09995. eCollection 2022 Aug.

Authors

Fanxiao Kong^{1

2}, Yanmei Yang¹, Hao Chen¹, Haiyan Liu³, Chao Fan², Weidong Xie¹, Guobing Wei¹

Affiliations

¹ College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China.
² School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou 545006, PR China.
³ School of Engineering and Technology, Guangxi University of Science and Technology, Liuzhou 545006, PR China.

Abstract

Due to limited basal slips, the recrystallization of Mg-Zn-Nd-Zr alloys originated at grain boundaries with large orientation gradient based on strain-induced-boundary-migration nucleation mechanism. The primary driving force of the recrystallization was the distortion energy difference around grain boundaries. However, more non-basal slips occurred near the grain boundary at larger strain deformation, so that some dislocations of adjacent subgrain boundaries with less orientation difference transferred to other subgrain boundaries by means of dissociation and disassembly, which is called the subgrain boundary merging. Meanwhile, some ductile shear zones appeared surrounding the primary grain, which held multiple slip systems moving around the grain boundary, gave rise to larger orientation gradients and facilitated recrystallization grains growing.

Keywords: Constitutive relation; Dynamic recrystallization; Hot rolling; Magnesium.