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The application of a shear stress to a dislocation segment causes not only energy changes of the dislocation but also entropy changes. For a dislocation kink chain, the entropy change leads to a significant increase in the restoring force for dislocations which have small angles against close-packed directions. For a dislocation string, the entropy contribution to the restoring force is negligible.
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G. Alefeld (1965) studied this question.
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