Carlos N. Tome¹, M Arul Kumar¹, John Graham¹, Khanh Dang¹, Yue Liu², Pengzhang Tang², Shujuan Wang¹, Rodney McCabe¹, Laurent Capolungo¹; ¹Los Alamos National Laboratory, ²Shanghai Jiao Tong University

Transmission of {1012} mechanical twins across grain boundaries in Mg is a mechanism that can facilitate intergranular crack propagation by providing a path to cracks along along the twin interface. Until now the focus has been on a 2D characterization of twin transmission along the forward propagation direction. Recent 3D studies of the twin domain interface reveal anisotropic mobility and a relative easiness of lateral twin propagation as opposed to forward or normal propagation. Here we study the forward and the lateral twin transmission into neighbors applying a variety of experimental and computational characterization techniques, namely: (1) statistical EBSD analysis of twin sections; (2) Phase Field simulations of twin growth; (3) 3D Molecular Dynamic simulations of twins reacting with grain boundaries. This study improves our understanding of the transmission mechanisms in a 3D aggregate, and helps us to develop criteria for treating twin modeling in CP simulations.