| Abstract Scope |
Planar-slip, or dislocation motion localized to a few slip planes, can be observed in many concentrated substitutional FCC alloys. This is largely attributed to short-range ordering (SRO) and the slip-plane softening effect, where the first dislocation in a planar-slip region forms a diffuse anti-phase boundary (DAPB), which causes subsequent dislocations to glide with less resistance. This study focuses on incorporating the effect of SRO and the DAPB on cross-slip energetics and planar-slip. Using Ni-10%Al as a model alloy, atomistic modeling will be used to derive dislocation mobility laws as a function of ordering and temperature, as well as cross-slip activation barrier distributions as a function of order and DAPB presence. These will be input into models for correlated cross-slip and screw dislocation annihilation, two mechanisms which have the potential to increase work-hardening. This extends previous understanding of SRO effects on mechanical properties beyond that of traditional DAPB strengthening. |