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The current interest in compositionally complex alloys including so calledhigh entropy alloys has caused renewed interest in the general problem ofsolute hardening. It has been suggested that this problem can be addressed bytreating the alloy as an effective medium containing a random distribution ofdilatation and compression centers representing the volumetric misfit of atomsof different species. The mean square stresses arising from such a randomdistribution can be calculated analytically, their spatial correlations arestrongly anisotropic and exhibit long-range tails with third-order power lawdecay. Here we discuss implications of the anisotropic and long-range nature ofthe correlation functions for the pinning of dislocations of arbitraryorientation. While edge dislocations are found to follow the standard pinningparadigm, for dislocations of near screw orientation we demonstrate theco-existence of two types of pinning energy minima.

Pinning of dislocations in disordered alloys: Effects of dislocation orientation