Dsc analysis of a cuznal two way shape memory alloy during ageing

The degradation behavior of two way shape memory effect in a Cu-20.4Zn-5.6Al (mass fraction, % ) alloy by differential scanning calorimetry has been dealt with. Calorimetric technique has been revealed as a powerful way to obtain information concerning the evolution of the trained material. After ageing for several hours at relatively low temperature, the change of martensite from preferred orientation to self-accommodation results in the degradation of TWSME which is recoverable. After ageing at relatively low temperatures ( 100 "C , 140C ) for longer time or ageing at high temperature ( 200 "C ), the degradation of TWSME is irrecoverable which results from precipitate.