The yield strength anomaly in some L12 compounds was linked to the thermally assisted cross slip of screw super-dislocations. This work continues earlier efforts to understand the yield strength anomaly in L12 alloys using computer simulations of dislocation motion. Dislocations were modelled within isotropic elasticity theory, and simple rules were used to model the cross-slip process in the two dimensional geometry of the simulation. The velocity of a single dislocation in Ni3Al was studied as a function of the applied stress. The observed velocities vary nonlinearly with the applied stress. Further, dislocations were observed to become immobile for small applied loads. At high stresses, the dislocations were observed to advance relatively unhindered by the thermally activated cross slip process. Fluctuations in the velocity of the dislocations were studied, and their autocorrelation function shows an increased correlation time near a threshold stress. This threshold stress was identified with the critical stress proposed in earlier works

Simulation of Dislocation Dynamics in Ni3Al: a Study of Velocity Autocorrelations. Erdonmez, C.K., Chrzan, D.C.: Materials Research Society Symposium – Proceedings, 2000, 578, 143-8