Revealing twin-induced deformation mechanisms of AZ31 Mg alloy sheet during warm deep drawing

作者：Lei Tian, Lifei Wang, Xinwei Fu, Kun-kun Deng, Xiao Wang, Liuwei Zheng, Hongxia Wang, Qiang Zhang, Kwang Seon Shin · 发表于：Journal of Magnesium and Alloys · 年份：2025 · DOI：10.1016/j.jma.2025.02.002 · 被引用次数：9 · 研究领域：Magnesium Alloys: Properties and Applications、Advanced Welding Techniques Analysis、Aluminum Alloys Composites Properties

• The {10–12} twins improve deep drawability of AZ31 sheet by 32% at 200℃. • The {10–12} twins promote more deformation mechanisms during warm deep drawing. • Deep drawing deformation produces biaxial and uniaxial stress states. • Stress states affect deformation mechanisms and their competitive relationships. In this work, the {10–12} tensile twins are introduced to improve the drawability of the AZ31 Mg alloy sheet. Concretely, the drawing depth is increased by 32% compared with the as-received sheet at 200 °C. This is because {10–12} tensile twins promote the occurrences of many deformation mechanisms during warm deep drawing, such as slips, detwinning, dynamic recrystallization (DRX) behaviors, etc. Further, based on the different stress states during deep drawing, these mechanisms and their competition relationships, as well as texture evolutions, are systematically studied. Combined with critical resolved shear stress (CRSS) and microstructure evolution, the global Schmid factor (GSF) obtained by quantizing stress states by stress tensor (σ) can accurately predict the activation trend of deformation mechanisms. It is found that the stress states have a reverse influence on the activation trend of the {10–12} twinning and detwinning. The change of stress states affects the competitive relationships between detwinning and DRX, and then affects the process and degree of DRX. The {10–12} tensile twins and large plane strain promote the activation of prismatic slips, and the...