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Dislocation Core Energies and Core Fields from First Principles

Abstract : Ab initio calculations in bcc iron show that a <111> screw dislocation induces a short-range dilatation field in addition to the Volterra elastic field. This core field is modeled in anisotropic elastic theory using force dipoles. The elastic modeling thus better reproduces the atom displacements observed in ab initio calculations. Including this core field in the computation of the elastic energy allows deriving a core energy which converges faster with the cell size, thus leading to a result which does not depend on the geometry of the dislocation array used for the simulation.
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Contributor : Emmanuel Clouet Connect in order to contact the contributor
Submitted on : Monday, February 9, 2009 - 3:51:32 PM
Last modification on : Monday, December 13, 2021 - 9:14:34 AM
Long-term archiving on: : Thursday, June 30, 2011 - 10:51:07 AM

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  • HAL Id : hal-00359884, version 1
  • ARXIV : 0902.1451

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Emmanuel Clouet, Lisa Ventelon, François Willaime. Dislocation Core Energies and Core Fields from First Principles. Physical Review Letters, American Physical Society, 2009, 102 (5), pp.055502. ⟨hal-00359884⟩

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