Twinning-assisted static recrystallization and texture evolution in a Mg-Gd-Y-Zr alloy

作者：Wenting Jiang, Xinyu Ren, Lei Yu, Jingli Sun, Song Ni, Yi Huang, Min Song · 发表于：Journal of Materials Research and Technology · 年份：2024 · DOI：10.1016/j.jmrt.2024.01.007 · 被引用次数：20 · 研究领域：Magnesium Alloys: Properties and Applications、Hydrogen Storage and Materials、Aluminum Alloys Composites Properties

The formability and mechanical properties of magnesium (Mg) alloys are strongly related to the crystallographic basal texture. Twins play critical roles in adjusting crystallographic orientation of grains during both deformation and annealing treatment via deformation twinning and twinning-assisted recrystallization. In this study, cold rolling and subsequent annealing were conducted on a Mg-5.9Gd-3.3Y-0.5Zr alloy to investigate the recrystallization behavior and texture evolution. Electron backscatter diffraction and transmission electron microscopy techniques were applied to characterize the nucleation of recrystallized grains, especially the twinning-assisted recrystallization, at multi-scales. The results indicated that a large number of {101¯2}, {101¯1} twins and {101¯1}‐{101¯2} double twins were introduced after cold rolling. The {101¯1}‐{101¯2} double twins, double twin - grain boundary intersections and dense twin-twin intersections acted as the preferential nucleation sites for recrystallization during annealing treatment, while the coarse and parallel {101¯2} twins were unfavorable for the nucleation of recrystallized grains. Although {101¯2} tension twins are the most common twins in Mg alloys, the interface of this type of twin has strong mobility and is easy to expand. Therefore, it is generally difficult for a single {101¯2} twin to recrystallize. However, the {101¯1} compression twins and {101¯1}‐{101¯2} double twins are generally difficult to expand and can st...