It was recalled that the shear yield stress, τ, due to the {11▪2}<¯1¯1▪3> second-order pyramidal slip system in hexagonal close-packed Mg crystals increased with increasing temperature. This result was explained by positing 2 thermally activated processes: the dissociation of a (c+a) edge dislocation with a Burgers vector of 1/3<¯1¯1▪3> into a c sessile dislocation and an a glissile basal dislocation, and the subsequent immobilization of the (c+a) edge dislocation. The consequent double cross-slip of (c+a) screw dislocations which had to be activated thermally by an increment of applied stress to increase the propagation velocity of slip band width.

Effect of Temperature and Shear Direction on Yield Stress by {11▪2}<¯1¯1▪3> Slip in HCP Metals. H.Tonda, S.Ando: Metallurgical and Materials Transactions A, 2002, 33[3A], 831-6