Anti-phase boundary energy in β-CuZn

Abstract

Abstract The ⟨111⟩ superlattice dislocations in a B2 ordered β-CuZn alloy have been studied using weak-beam electron microscopy, and the anti-phase boundary (APB) energy γ has been determined without ambiguity from the separation of two super-partials for {110} and {112} planes. Values of 50 mJ m−2 and 37 mJ m−2 are obtained for γ110 and γ112, respectively. The operative slip systems in β-CuZn at low temperatures have been discussed on the basis of the direct measurement of γ110 and γ112.