Abstract
The atomic motions in the twinning deformation of hexagonal close-packed (HCP) crystals was investigated at the atomic scale by using the giant atomic clusters (GACs) induced model, aimed at deepening the understanding to the twinning mechanism. It is found that the twin boundaries are composed of gradually oriented GACs with their orientation between the matrix and the twin, and the GACs can transfer their rotation under adequa te stress, which supplies a reasonable explanation for the occurrence of twinning. These findings are relevant for understanding the underlying origin behind many intriguing phenomena in the HCP crystals.
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