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Dynamical Effects on Dislocation Glide through Weak Obstacles

Published online by Cambridge University Press:  01 February 2011

Masato Hiratani  and
Vasily V. Bulatov
Masato Hiratani
Affiliation:
Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
Vasily V. Bulatov
Affiliation:
Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
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Abstract

Underdamped dislocation motion through local pinning obstacles is studied computationally using a stochastic dislocation dynamics scheme. The global dislocation velocity is observed to be non-linearly stress dependent. Strongly non-Arrhenius dynamics are found at a higher stress range. The statistical analysis indicates that the correlation of the local dislocation kinetic energy is extended and exceeds the average obstacle spacing as temperature decreases, which can lead to the inertial dislocation bypass of the obstacles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 882: Symposium EE – Linking Length Scales in the Mechanical Behavior of Materials , 2005 , EE4.4
Copyright
Copyright © Materials Research Society 2005

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