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Modeling of Dislocation Mobility in Metals: Effect of Obstacles and Thermal Processes

Published online by Cambridge University Press:  14 March 2011

Masato Hiratani  and
Hussein M. Zbib
Masato Hiratani
Affiliation:
School of Mechanical and Materials Engineering, Washington State University Pullman, WA 99164-2920
Hussein M. Zbib
Affiliation:
School of Mechanical and Materials Engineering, Washington State University Pullman, WA 99164-2920
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Abstract

Thermally activated dislocation glide velocity through weak point obstacle arrays is studied analytically and computationally. Thermal activation rate is estimated using the modified Friedel relations under the weak obstacle approximation. The average flight velocity after an activation event as a function of stress and temperature is obtained by the discrete dislocation dynamics (DD). This numerical calculation includes the effect of self-stress, interaction with electrons and phonons, and the inertial effect. These results are implemented into a phenomenological model to study the dislocation velocity under various conditions. The model can reproduce both obstacle control and drag control motion in low and high velocity regions, and a flow stress anomaly at transient regions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 683: Symposium BB – Materials Instabilities and Patterning in Metals , 2001 , BB5.8.1
Copyright
Copyright © Materials Research Society 2001

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References

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