|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Ultrafine-grained Materials X
||Strengthening and Toughening Effects of Twin Mesh Structures in Polycrystalline Mg
||Xin Wang, Lin Jiang, Dalong Zhang, Chase Cooper, Ruilin Wang, Ali Hernandez, Timothy Rupert, Subhash Mahajan, Irene J. Beyerlein, Enrique J. Lavernia, Julie M. Schoenung
|On-Site Speaker (Planned)
Coherent twin boundaries are known to promote strengthening without much loss of ductility. However, twin meshes, defined as two or more intersecting arrays of twins within a grain, have received much less attention, and their effects on the strength and toughness in HCP metals. In this study we designed an experimental strategy using a SPEX mixer/mill to introduce twin meshes in a hot-rolled Mg sheet. As revealed by EBSD and TEM investigations, two or more twin variants were activated in most grains in the twinned coarse grain region, as a result of the high frequency, multi-directional deformation strain. Tensile test results show that the samples with twin meshes are both stronger and tougher than the samples without them. Furthermore, the twin meshes effectively randomized the initially strong texture of the starting material, which indicates twin meshes would lead to a reduction in plastic anisotropy and tension-compression asymmetry.
||Planned: Supplemental Proceedings volume