Three-dimensional study of grain scale tensile twinning activity in magnesium: A combination of microstructure characterization and mechanical modeling

• DOI: 10.1016/j.actamat.2023.119043
• Publication Date: 2023-05-30T18:47:47Z
• Authors: Xun Zeng; Chuanlai Liu; Chaoyu Zhao; Jie Dong; Franz Roters; Dikai Guan
• Keywords: Condensed Matter - Materials Science; 0103 physical sciences; Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences; 01 natural sciences; 620

Tensile twinning is a main deformation mode in hexagonal close packed structure metals, so it important to comprehensively understand mechanisms which are not fully disclosed using 2D or small volume 3D characterization techniques. A large area electron backscatter diffraction (EBSD) measurement and crystal plasticity modeling were carried out investigate the tensile behaviors magnesium (Mg) alloy. The results showed that activity was underestimated conventional EBSD scans. When compressed yield point, examined twin frequency with lower than EBSD. effects of Schmid factor (SF) on investigated. Almost all high (SF>0.35) grains twinned. surprising 82% middle SF (0.35>=SF>=0.15) observed, unexpected since believed be unfavorable for twinning. low (SF<0.15) slightly increased from due twins. shear stress maintained level homogeneously distributed grains, facilitating nucleation growth. heterogeneously within twins nucleated areas positive stress. favorable occurred vicinity accumulation. Twinning activities same grain varied different layers. It attributed fluctuation derived environment changes.