Investigating the hot deformation behavior and microstructural evolution of Mo-14Re alloy at various strains and strain rates

作者：Yanchao Li, Wenbin Liu, Jianfeng Li, Xiaohui Lin, Jing Liang, Yichao Yang, Xin Zhang, W. Zhang, Hailong Xu · 发表于：Journal of Materials Research and Technology · 年份：2024 · DOI：10.1016/j.jmrt.2024.09.094 · 被引用次数：19 · 研究领域：Magnesium Alloys: Properties and Applications、Microstructure and mechanical properties、Advanced materials and composites

This study examines the hot deformation behavior of Mo-14Re alloy at various true strains (15%, 35%, 65%) and strain rates (0.01 s −1 , 10 s −1 ) at a temperature of 1400K. The findings indicate that dynamic recovery (DRV) and dynamic recrystallization (DRX) occur concomitantly as strain increases at a low strain rate of 0.01 s −1 , with DRV being the predominant softening mechanism. At a strain of 65%, DRX emerges as the primary softening process. Conversely, under high strain rates of 10 s −1 , DRX is inhibited, and the Mo-14Re alloy experiences work hardening due to an increase in dislocation density . Microscopic analysis shows that the high-density dislocations facilitate the continued nucleation and growth of recrystallized grains at low strain rates. At high strain rates, tangled dislocations hinder dislocation motion and recrystallization. Regarding texture evolution, stronger {100}//CD and weaker {111}//CD fiber texture is observed at low strain rates of 0.01 s −1 , while stronger {111}//CD and weaker {100}//CD fiber texture forms at high strain rates of 10 s −1 , with enhanced texture intensity. Mechanistic analysis confirms the activation of the {110}<111>, {112}<111>, and {123}<111> dislocation slip systems at elevated temperatures, with the {123}<111> system being the most dominant.