The effect of martensite aging in Ti–Pd and Ti–Pd–Ni high temperature shape memory alloys was investigated by DSC measurements and TEM observations. It is shown that the aging effect is strongly dependent on the alloy composition. Ti50Pd50 and Ti50Pd40Ni10 alloys exhibit a pronounced martensite aging effect, but no obvious aging effect was observed in Ti50Pd50−xNix (x≥20) alloys. The magnitude of the aging effect in the Ti50Pd40Ni10 alloy is much greater than that in the Ti50Pd50 alloy and the composition dependence of the aging effect is discussed. Besides, a curious feature of martensite aging was observed, i.e., As and Af temperature increase does not saturate even after relatively long time aging. This is considered to be due to the recovery·recrystallization of martensite during aging.
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Cai et al. (1999) studied this question.
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