Thermally assisted motion of dislocations in solid solution-strengthened fcc alloys and the concept of “stress equivalence”

Abstract

Abstract It is demonstrated that relatively well established developments of the collective interactions of moderately concentrated solute atoms with a dislocation can furnish a satisfactory model for the thermally assisted motion of dislocations through such solute fields and provide insight into the concept of “stress equivalence” exhibited by binary fcc alloys. This is consistent with known dependencies of the plastic shear resistance on temperature and the universal dependence of the activation volume on flow stress alone, for a large family of binary fcc alloys of different solute concentration. Both the successful features of the model and some of its shortcomings are discussed.