The mechanism of pre-twinning on enhancing strength of AZ31 magnesium alloy

作者：Chen Li, Wei Liang, Lifei Wang, Quan-xin Shi, Lin Peng, Xing Zhang, Wanggang Zhang, Shuyong Jiang · 发表于：Journal of Magnesium and Alloys · 年份：2025 · DOI：10.1016/j.jma.2025.09.026 · 被引用次数：6 · 研究领域：Magnesium Alloys: Properties and Applications、Aluminum Alloys Composites Properties、Advanced Welding Techniques Analysis

• New free compression and width-constrained rolling (FCWR) of AZ31 sheet is proposed. • FCWR of AZ31 sheet can eliminate strong basal texture and considerably refine grains. • Multiple slip systems are activated and plenty of preset twins are induced under FCWR. • Preset twins can enhance the strength of AZ31 magnesium alloy at room temperature. A strong basal texture is typically developed in magnesium alloy sheets that have been subjected to the rolling process. Consequently, their mechanical properties and formability are significantly impaired, which in turn restricts potential applications. In this study, an innovative texture-altering technique, which involves in-plane free compression and width-constrained rolling (FCWR), is used for AZ31 alloy sheets in order to manufacture magnesium alloy sheets with both high strength and high ductility. During FCWR deformation process, a substantial number of tensile twins and a small quantity of (10 1 ‾ 2) - (01 1 ¯ 2) twin-twin boundaries are induced to coordinate plastic deformation. It is precisely the presence of such crossed twins that impedes the detwinning of partial twins under low-stress conditions. The retained twins hinder the motion of dislocation, thereby enhancing the strength. Specifically, the yield strength of preset crossed twins sample along rolling direction, 45° and transverse direction has increased by 105 %, 16.8 % and 23 %, respectively. Additionally, the ultimate tensile strength along these three directi...