The temperature ranges of the thermal and athermal deformation behaviors of nickel were identified by employing the temperature-dependence of flow-stress and strain-rate cycling data. The results were used to present a unified view of dislocation mechanisms of glide which encompassed the two thermally activated and intermediate athermal regimes of plastic flow. In the low-temperature thermally activated region (<250K), the strain rate was found to be controlled by the repulsive intersection of glide and forest dislocations. The results were used to deduce that the stacking-fault energy of Ni was 234mJ/m2.

Dislocation Mechanisms for Plastic Flow of Nickel in the Temperature Range 4.2-1200K. D.H.Sastry, K.Tangri: Philosophical Magazine, 1975, 32[3], 513-25