Micro-texture-mediated dynamic hetero-deformation enabling high strength-ductility in a dilute Mg-Al-Ca-Mn alloy

作者：Siqing Wang, Tong Wang, Shi-Chao Wang, Jiarui Chen, Hai-Long Jia, Min Zha, Huiyuan Wang · 发表于：Materials Research Letters · 年份：2025 · DOI：10.1080/21663831.2025.2498647 · 被引用次数：13 · 研究领域：Magnesium Alloys: Properties and Applications、Microstructure and mechanical properties、Metal and Thin Film Mechanics

Micro-texture design of hard-/soft-oriented grains improves Mg alloys' mechanical properties, while strength-ductility trade-off persists due to insufficient early-stage strengthening from soft-oriented grains and later-stage strain coordination in hard-oriented grains. Here, a TD-spread basal-textured dilute Mg-1.27Al-0.38Ca-0.45Mn alloy architected by uniformly-mixed basal-/TD-/random-oriented grains was prepared by simple hard-plate rolling and short-time annealing. Interestingly, it features dynamic hetero-deformation as TD-oriented grains initially act as hard domains enhancing strength and later function as soft domains by activating multiple non-basal slips. Facilitated by such hard-to-soft transition of TD-oriented grains, a superior strength-ductility combination (yield strength of ∼218 MPa, elongation of ∼27.3%) was achieved.