Insights on activation enthalpy for non-Schmid slip in body-centered cubic metals

• DOI: 10.1016/j.scriptamat.2014.11.035
• Publication Date: 2014-12-19T20:38:33Z
• Authors: Lucas M. Hale; Hojun Lim; Jonathan A. Zimme...; Corbett C. Battaile; Christopher R. We...
• Keywords: Cubic crystal system

We use insights gained from atomistic simulation to develop an activation enthalpy model for dislocation slip in body-centered cubic iron. Using a classical potential that predicts dislocation core stabilities consistent with ab initio predictions, we quantify the non-Schmid stress-dependent effects of slip. The kink-pair activation enthalpy is evaluated and a model is identified as a function of the general stress state. Our model enlarges the applicability of the classic Kocks activation enthalpy model to materials with non-Schmid behavior.