The {10(1)over-bar2} non-cozone twin-twin interactions in Mg: A stability and mobility study using 3-D atomistic simulations

SCRIPTA MATERIALIA

卷:200

Article

Dang, Khanh¹  Tome, Carlos N.¹  Capolungo, Laurent¹ 

[1] Los Alamos Natl Lab, MST-8, Los Alamos, NM 87544 USA

关键词: Twinning;    Twin twin interaction;    HCP metals;   

DOI  :  10.1016/j.scriptamat.2021.113913

来源: Elsevier

【 摘 要 】

Due to easy activation of tensile twinning in Mg, multiple {10 (1) over bar2} twin variants can interact with each other and form twin-twin boundaries over the course of plastic deformation. Previous studies using 2-D settings provide only a partial understanding of these interactions, especially the non-cozone ones. Here, atomistic simulations are used to study the 3-D structural characteristic and evolution of the non-cozone {10 (1) over bar2} twin-twin junctions. The study reveals the existence of new twin-twin boundaries (TTBs) such as TTBBP and TTBK2, formed after the interaction between the basal prismatic and conjugate twin interfaces with the coherent twin boundary. For both non-cozone twin-twin interactions, the {(1) over bar2 (1) over bar2} TTB and its associated twin-twin junctions are found to play a major role in the {10 (1) over bar2} twin's stability and mobility. Specifically, they promote the growth of the 3-D twin in both the normal and forward directions during the interaction and hinder the detwinning process upon unloading. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free