The effect of deformation on precipitation of ?? and ? in Al?4% Cu

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Abstract
An investigation has been carried out into the effect of simultaneous creep deformation, at a strain rate of 2·4% per hour, on precipitate formation in an Al-4% Cu alloy. All the straining and ageing treatments reported here were conducted at 300°c, for times up to three hours. Thin-film electron microscopy and micro-indentation hardness techniques were employed to follow the precipitate formation. The effect of deformation on the early stages of precipitation was to retard θ′ formation, due to segregation of solute to edge components of helical dislocations. Some primary intragranular θ precipitation was also observed apparently heterogeneously nucleated on dislocations.