Abstract
A series of atomistic calculations is performed in order to establish criteria for dislocation emission from cracks in a model hexagonal lattice. We find that except for special orientations, additional tensile broken-bond effects must be added to existing theories based on shear effects, in order to correctly estimate the critical stress intensity Ke required for dislocation emission. From this, a new ductility criterion for materials is proposed which does not depend on the intrinsic surface energy, but contains only the unstable stacking fault parameter.
Original language | English |
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Pages (from-to) | 852-855 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 72 |
Issue number | 6 |
DOIs | |
State | Published - 1994 |