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A theoretical model is suggested to describe the dislocation-mediated mechanisms for the nucleation and growth of nanoscale deformation twins in hexagonal-close-packed materials. In the framework of the model, the nanoscale deformation twins nucleate and grow through the glide of glissile Shockley partial dislocations which are generated due to the nonplanar dissociation of the leading dislocation...
Interaction of the cooperative grain boundary sliding and migration with a crack in deformed nanocrystalline materials is investigated using the complex variable method. Effects of the two disclination dipoles produced by the cooperative deformation on the emission of lattice dislocations from the crack tip are theoretically described. The complex form expressions of the stress field and the force...
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