The deformation of CuAu I

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Abstract
The ordered alloy CuAu I was deformed in tension at room temperature and the deformation mechanism was investigated by electron microscopy. It was found that the predominant deformation mechanism is {111} mechanical twinning and not slip, as has been proposed by Syutkina and Yakovleva (1967). The CuAu I microstructure is composed of microtwins on {101} planes formed during the ordering process and the interaction of mechanical {111} twins with the order twins was investigated. It is probable that the CuAu I crystal structure is changed by the deformation process to one resembling the CuPt ordered alloy in which {111} planes of like atoms alternate.