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This study theoretically analyzes the toughening effect of the nanoscale twinning induced by the high stress concentration at the particle/matrix interfacial crack tip on fine-grained magnesium (Mg) alloys. The nanoscale twinning within the interfacial crack-tip plastic zone is modeled by a wedge disclination quadrupole. The closed form expressions of the stress intensity factors (SIFs) and the energy...
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