The {101¯2} non-cozone twin-twin interactions in Mg: A stability and mobility study using 3-D atomistic simulations. (15th July 2021)

• Record Type: Journal Article
• Authors: Dang, Khanh; Tomé, Carlos N.; Capolungo, Laurent
• Is Part Of: Scripta materialia. Number 200(2021)
• Publication Date: 2021-07-15
• Subjects: Twinning -- Twin twin interaction -- HCP metals; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.113913
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Due to easy activation of tensile twinning in Mg, multiple { 10 1 ¯ 2 } 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 ¯ 2 } 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 ¯ 2 1 ¯ 2 } TTB and its associated twin-twin junctions are found to play a major role in the { 10 1 ¯ 2 } 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. Graphical abstract: Image, graphical abstract