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Reaction pathway analysis for dislocation nucleation from a Ni surface step

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3 Author(s)
Hara, Shotaro ; Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-0033, Japan ; Izumi, Satoshi ; Sakai, Shinsuke

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Threshold strain required for a thermally activated dislocation nucleation from a Ni surface step has been measured using an atomistic-based reaction pathway analysis. We show that the saddle-point configuration and the stress-dependent activation energy are strongly influenced by the presence of a surface step. Our results provide insight into the previous experimental findings concerning the mechanism on a coherency loss at the Ni/Cu(001) interface. We conclude that the coherency strain caused by a lattice mismatch between Ni and Cu does not yield a sufficient driving force for the dislocation nucleation.

Published in:

Journal of Applied Physics  (Volume:106 ,  Issue: 9 )

Date of Publication:

Nov 2009

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