Abstract
Cu−Al alloys can be significantly strengthened after deformation by a suitable low temperature thermal treatment. Possible mechanisms for this strength increase have been investigated using a number of techniques including differential thermal analysis, electron microscopy and diffraction. It has been found that strength increases could be associated with the development of order in the alloys, and the magnitude of the increases have been found to be dependent on the amount of prior deformation, the amount of order and thee/a ratio. An ordered phase based on an fcc lattice has been identified at higher aluminum concentrations. It is suggested that this phase is Cu3Al. It is postulated that strain fields associated with the formation of ordered regions which nucleate on stacking faults are responsible for the observed strengthening.
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