Effect of the local environment on the mobility of dislocations in refractory bcc metals: Concurrent multiscale approach

Zhengzheng Chen, Gang Lu, Nicholas Kioussis, and Nasr Ghoniem
Phys. Rev. B 78, 134102 – Published 6 October 2008

Abstract

Using a concurrent multiscale approach we demonstrate that the local environment of transition-metal solutes in refractory bcc metals has a large effect on the mobility and slip paths of dislocation. The results reveal that solid solutes or nanoclusters of different geometries may lead to solid-solution hardening or softening, in agreement with experiment, including spontaneous dislocation glide and activation of new slip planes. The underlying electronic mechanism is the change in the anisotropy of the lattice resistance induced by solutes.

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  • Received 16 July 2008

DOI:https://doi.org/10.1103/PhysRevB.78.134102

©2008 American Physical Society

Authors & Affiliations

Zhengzheng Chen1, Gang Lu1, Nicholas Kioussis1, and Nasr Ghoniem2

  • 1Department of Physics, California State University, Northridge, California 91330-8268, USA
  • 2Department of Mechanical and Aerospace Engineering, University of California–Los Angeles, Los Angeles, California 90095, USA

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Issue

Vol. 78, Iss. 13 — 1 October 2008

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