Time-dependent elastic constant C' of βCu-Zn-Al alloy during a reordering process: relation with the martensitic transformation

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Abstract
The authors present a study of the early stages of aging in a beta Cu-Zn-Al sample, just after heat treatment at a moderate temperature Ti and a quench to Tf>Ms, The measurement of the elastic constant C', followed by a stage of slower decrease. The two are separated by a transient increase in C'. A good correlation has been found between these variations and the change of the martensitic transformation temperature. These results have been interpreted in terms of reordering of the beta phase: the first stage is influenced by the decrease in vacancy concentration whereas the second stage corresponds to reordering at a constant vacancy concentration. A phenomenological model developed elsewhere explains the correlation between the martensitic transformation temperature and the elastic constant C' particularly well.