Competing twinning mechanisms in body-centered cubic metallic nanowires. (1st March 2016)

• Record Type: Journal Article
• Authors: Shi, Zhe; Singh, Chandra Veer
• Is Part Of: Scripta materialia. Volume 113(2016)
• Page Start: 214
• Page End: 217
• Publication Date: 2016-03-01
• Subjects: Molecular dynamics (MD) -- Nanostructured materials -- Twinning -- Deformation structure; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.11.006
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Twinning in body-centered cubic metals is typically attributed to glide of 1/6 < 111 > dislocations originated from material defects. Here we report an alternative mechanism for twin formation in body-centered cubic nanowires using molecular dynamics simulations. In this mechanism, twinning is triggered by dissociation of the 1/6 < 111 > dislocation into two 1/12 < 111 > partials gliding on adjacent {211} planes. By comparing the generalized stacking fault energies of the two competing twin boundary configurations in five different BCC crystals, the propensity of a particular mechanism to occur is evaluated. The fundamental insight gained from this study will help engineer nanoscale materials with novel mechanical properties. Graphical abstract: