Shear response of Σ 3 { 112 } twin boundaries in face-centered-cubic metals
2011; American Physical Society; Volume: 83; Issue: 6 Linguagem: Inglês
10.1103/physrevb.83.064106
ISSN1550-235X
AutoresJian Wang, Amit Misra, J. P. Hirth,
Tópico(s)Theoretical and Computational Physics
ResumoMolecular statics and dynamics simulations were used to study the mechanisms of sliding and migration of \ensuremath{\Sigma}3{112} incoherent twin boundaries (ITBs) under applied shear acting in the boundary in the face-centered-cubic (fcc) metals, Ag, Cu, Pd, and Al, of varying stacking fault energies. These studies revealed that (i) ITBs can dissociate into two phase boundaries (PBs), bounding the hexagonal 9$R$ phase, that contain different arrays of partial dislocations; (ii) the separation distance between the two PBs scales inversely with increasing stacking fault energy; (iii) for fcc metals with low stacking fault energy, one of the two PBs migrates through the collective glide of partials, referred to as the phase-boundary-migration (PBM) mechanism; (iv) for metals with high stacking energy, ITBs experience a coupled motion (migration and sliding) through the glide of interface disconnections, referred to as the interface-disconnection-glide (IDG) mechanism.
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