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Boundaries; kink versus ripplocation in graphite, MAX phases and other layered solids
Journal article   Peer reviewed

Boundaries; kink versus ripplocation in graphite, MAX phases and other layered solids

K. Sudhakar, G. Plummer, G.J. Tucker and M.W. Barsoum
Carbon (New York), v 213
Sep 2023
DOI: https://doi.org/10.1016/j.carbon.2023.118221

Abstract

Graphite Kink boundaries Layered solids MAX phases Mica Residual stresses Ripplocations boundaries Spontaneous reversibility
Kink boundaries, KBs, in metals are well defined entities that at low disregistry angles are identical to low angle grain boundaries, LAGBs. The latter are comprised of basal dislocations aligned normal to the basal planes in such a way that their strain fields cancel. A ripplocation is best defined as an atomic scale ripple. When ripplocations on adjacent planes nest, they define a ripplocation boundary, RB. Two oppositely signed adjacent RBs define a ripplocation band. Until recently, most RBs have been classified as KBs. In layered crystalline solids, LCS, when deformation is confined in two independent directions, with no possibility of twinning, most KBs should be classified as RBs. Herein, we show that in LCSs, RBs: i) are not atomically sharp; their strain fields are considerably delocalized, especially in comparison to KBs, ii) delaminate at high curvatures; iii) form nanobridges, and iv) are highly strained and, if not trapped, fully reversible. At extreme curvatures, the bonds are sundered and the RBs are no longer reversible and are reminiscent of KBs at the macroscopic scale. The distinction is important because whether delaminations nucleate and/or a material is highly strained has important and crucial ramifications on its deformation and ultimate failure.

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18 citations in Web of Science
12 citations in Scopus

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Collaboration types
Domestic collaboration
Web of Science research areas
Chemistry, Physical
Materials Science, Multidisciplinary
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