Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties · 1996 · 245 citations · 15 references
Natural SciencesMaterials EngineeringMaterials ScienceComputational Materials ScienceMetallurgySolid State PhysicsDefect ModelingDislocation MechanicsDislocation TheoryTransformation MechanismsDislocation BehaviorDislocation Burgers VectorsDislocation InteractionsDislocation MechanismsDislocation PhysicsDislocation SourcesDislocationsInterfacial Defects
Abstract Computer simulation has been used to study the interaction of a perfect, basal dislocation with a {1012} twin boundary in a hcp metal for the situation where the 1/3{1120} Burgers vector is inclined at 60° to the interface. It is found that slip is not transferred from one crystal to the other with a residual dislocation left at the interface. Instead, the matrix dislocation decomposes into interfacial defects. We show that as a result of this decomposition the matrix dislocation becomes a new source of twinning dislocations that produce twin growth when the appropriate stress is applied to the crystal. The mechanism described does not require twinning dislocations to multiply by a pole process.
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