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Dislocation Interaction with Point Defects in Transition-Metal Disilicides

Published online by Cambridge University Press:  21 March 2011

Man H. Yoo
Man H. Yoo*
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory Oak Ridge, TN 37831–6115, U.S.A.
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Abstract

Energetics of the formation of jog-pairs and kink-pairs on a straight dislocation are analyzed using anisotropic elasticity theory for the equivalent slip systems of seven transition-metal disilicides. While glide loops of the active slip systems are stable in all cases, having positive line tension, the interaction energies of two opposite segments in kink-pairs and jog-pairs are found to be very anisotropic with respect to dislocation orientation. The anisotropic interaction plays an important role in the glide resistance due to dislocation-point defect interactions. A dislocation model is proposed for the glide resistance on edge and near edge dislocations based on jog-pairs resulting from the contact interaction between dislocations and intrinsic point defects. The available data of yield strength anomaly and dislocation structures of disilicide crystals are discussed in view of the proposed model for jog-pair pinning and dynamic breakaway.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000, N4.10.1
Copyright
Copyright © Materials Research Society 2001

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References

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