Interaction of Dislocation with Atomic Order in Solid Solutions
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A mechanism of the interaction between a dislocation and the atomic order, which is due to the coupling of the stress field of the dislocation with lattice distortion accompanied by ordering in superlattice alloys, is proposed. The interaction energy and the locking force against the motion of the dislocation are calculated for the superlattice of the β-brass type by using the quasi-chemical treatment developed by Iwata. The effect of thermal motion on the locking force is also considered on the basis of H. Suzuki's treatment. The interaction energy and the locking force for an edge dislocation reveal a sharp peak at the Curie point of order-disorder transformation, while such a sharp peak is absent in a screw dislocation. The values for a screw dislocation are found to be 1〜10 per cent of those for an edge dislocation. Furthermore, the short-range order hardening is expressed in terms of order parameters for the superlattice of the β-brass type.
- 東北大学の論文
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