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Shape of Hollow Dislocation Cores: Elastic and Anisotropic Surface Energy Effects

Published

Author(s)

David J. Srolovitz, N Sridhar, J P. Hirth, John W. Cahn

Abstract

Evidence for the existence of hollow core dislocations has existed for nearly forty years. Such hollow cores are often found in growth spirals associated with screw dislocations. Examples of this type of morphology may be found in silicon carbide, copper indium sulfide, pyrite, gallium nitride, garnets and Yba2Cu307.. Edge dislocations with hollow cores have also been reported. Although most observations of hollow dislocations involve nearly circular core holes. Faceted hollow cores have also been observed in several materials. The present problem is a subset of a much more general one: namely, the determination of surface/interface equilibria shape of misfitting inclusions and inclusions in an external stress field, stress driven surface morphology instabilities. In this paper, we will describe and apply a general approach to determine equilibrium morphology in a system in which the thermodynamics is controlled by both elastic and (anisotropic) surface energies.
Citation
Shape of Hollow Dislocation Cores: Elastic and Anisotropic Surface Energy Effects

Keywords

anisotropy, dislocation, elasticity, hollow core

Citation

Srolovitz, D. , Sridhar, N. , Hirth, J. and Cahn, J. (2021), Shape of Hollow Dislocation Cores: Elastic and Anisotropic Surface Energy Effects, Shape of Hollow Dislocation Cores: Elastic and Anisotropic Surface Energy Effects (Accessed April 15, 2024)
Created October 12, 2021