The core structures of a ⅓〈1123〉{1122} edge dislocation under applied shear stresses in an h.c.p. model crystal

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Abstract
The behaviour of a ⅓〈1 123〉{1122} edge dislocation under the effect of an external shear stress applied on {1122} planes has been studied by computer calculation. Before the application of the external stress, the dislocation has either of two typos of core configuration; one spreads as two twin faults on {1121} and {1122} planes (type I) and the other as a stacking fault with a fault vector of b/2, hounding partial cores still having the same twin faults as in the type-I core (type II). When the shear stress is applied in a direction that corresponds to tension along the c axis, the {1121) twin develops from both types of core under suitable conditions. When the stress is applied in the opposite direction, the type-I core changes into type-II; the dislocation moves as an extended dislocation without development of the {1122} twin. The results are interpreted and discussed in the light of experimental observations on deformation in h.c.p. metals.

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