Deformation of layered solids: Ripplocations not basal dislocations. (October 2017)

• Record Type: Journal Article
• Authors: Barsoum, M.W.; Tucker, G.J.
• Is Part Of: Scripta materialia. Number 139(2017)
• Page Start: 166
• Page End: 172
• Publication Date: 2017-10
• Subjects: Layered solids -- Deformation -- Ripplocations -- Basal dislocations; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.04.002
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: It has long been assumed that basal dislocations were responsible for the deformation of layered, crystalline solids. Herein we make the case that, with the notable exception of some metals that kink, ripplocations - not basal dislocations - are the operative micromechanism. The reasons are: i) clear evidence for c-axis strain at multiple length scales including in transmission electron microscopy images; ii) strong influence of confining pressure on the compressive strengths of poly-, and especially single crystals; iii) ripplocations are a topological imperative if the layers are to move relative to each other, without breaking the in-plane bonds. Graphical abstract: