Unusual shear induced unconventional {1¯011} twinning in Mg. (15th April 2020)

• Record Type: Journal Article
• Authors: Ma, Shao-Lin; Tang, Xiao-Zhi; Zu, Qun; Guo, Ya-Fang
• Is Part Of: Scripta materialia. Number 180(2020)
• Page Start: 40
• Page End: 44
• Publication Date: 2020-04-15
• Subjects: Twinning -- Shear -- Mg -- Molecular dynamics; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.01.020
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Conventional ( 1 ¯ 011 ) twinning in hexagonal metals has the twin plane K 1 = ( 1 ¯ 011 ) and the corresponding twinning direction η 1 = [ 1 ¯ 01 2 ¯ ] . Twinning shear is generally accomplished through the gliding of two-layer and/or four-layer twinning dislocations (TDs) along η 1 associated with atomic shuffles. Using molecular dynamics simulations, we reveal that an unusual shear along − η 1 associated with atomic shuffles on the twin plane K 1 is resulted by gliding of a one-layer TD. Correspondingly, an unconventional { 1 ¯ 011 } twinning occurs through successive gliding of one-layer TDs. Such a twinning mechanism is found to be correlated to high stress/strain concentration, such as at crack tip. Graphical abstract: Image, graphical abstract