Journal
ACTA MATERIALIA
Volume 127, Issue -, Pages 351-358Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.01.020
Keywords
Dislocation climb; Vacancies; Nanoindentation; Pipe diffusion
Funding
- Israel Science Foundation [1656/12]
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In this work, we explore the role of dislocation climb in annihilating the dislocation microstructure produced during a nanoindentation test. We produce creep conditions in Molecular Dynamics (MD) simulations of nanoindentation and show that half prismatic edge dislocation loops annihilate via pipe diffusion of vacancies from the free surface. Inspired by the MD simulations, we develop a model for the annihilation rate of these loops via pipe diffusion and compare it with the contribution of bulk diffusion. The model allows us discussing the temperatures at which we expect climb to prevail in experimental conditions and explain why climb is imperative during nanoindentation experiments. (C) 2017 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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