Abstract
Aging effect on martensitic transformation in Cu83-XAl17MnX shape memory alloys (X = 10,12,14,16 and 18) have been investigated by electrical resistivity (ER) and differential scanning calorimeter (DSC) measurements. In Cu71Al17Mn12 aged at 373 K for 0.6 ks, we found that martensitic transformation occurred at around 100K in ER measurement. It was also confirmed that the transformation temperatures increased with aging temperature and time. In addition, an enthalpy of reverse transformation increased with aging temperature, but it exhibited no systematic dependence on the aging time. The enthalpy of reverse transformation in Cu71Al17Mn12 alloy aged at 473K for 0.6ks (As = 200 K), was estimated to be about 150 J/mol by DSC measurements, which is nearly equal to that in Cu-Al-Mn alloy transformed at around room temperature.
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