Abstract
The plastic deformation of β and γ phase silver-tin alloys, which are of significance in the formulation of dental amalgam, has been studied using transmission electron microscopy and electron channelling. Deformation twinning in the ordered orthorhombic γ phase on {0 1 1} planes has been confirmed and another twin plane {2 1 1} has been identified. The γ phase was also found to deform by slip on {0 0 1} and {0 1 0} planes; superlattice dislocations with Burgers vectors 1/2[1 0 0 ] have been identified on the (0 0 1) plane. The disordered h c p β phase deforms essentially by slip on the basal (0 0 0 1) plane by glide of 1/3〈¯2 1 1 0〉 dislocations.
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