Dislocation decoration by precipitation in gold-cobalt alloys

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Abstract
Precipitation from an alloy of gold +5 atomic % cobalt has been observed by electron microscopy using replication and transmission techniques. The precipitate particles form a rectangular grid of lines when observed on {100} faces and mainly parallel lines when observed on {110} faces. The simplest explanation is that dislocations on {110} planes are decorated by cobalt precipitation. These dislocation walls are presumed to have arisen from polygonization during ageing. Geometrical arguments are presented.