The dissociated structure of the a<10¯1> super-dislocations in Ni3Al was predicted as a function of temperature. The temperature dependence of the relevant fault Helmholtz-free energies and elastic constants were calculated within the quasiharmonic approximation using the embedded atom method. The results of these calculations were then incorporated into anisotropic elasticity theory-based calculations of the dissociation distances. The cross-slip activation enthalpy was estimated and found to decrease by 24% at 600K when compared with its 0K value.

Temperature-Dependent Structure of a<10¯1> Superdislocations in Ni3Al. Chrzan, D.C., Foiles, S.M., Daw, M.S., Mills, M.J.: Materials Research Society Symposium – Proceedings, 1995, 364[2], 731-6