engleski

Influence of Betatisation Temperature on Thermal Transformation Behaviour of CuZn27Al 3 Alloy

Thermal transformation behaviour of the CuZn27Al 3 shape memory alloy has been analysed after betatisation and quenching from the temperatures of 600°C to 800°C. The specific behaviour of the alloy in the thermal transformation range has been analysed by means of differential scanning calorimetry and micrographic testing. The results show a significant dependence of the austenitic martensitic transformation on the temperature of thermal treatment, particularly if T<700°C. Apart from the variation in transformation temperatures there is also a change of characteristic temperature hysteresis which is related to the occurrence of sub-grains and formation of crystals of alpha-solid solution, changing also the chemical composition of the beta-phase. The betatisation above 700°C facilitates the flow of both austenitic and martensitic reactions. With the increase in temperature the betatisation gradually narrows the range of the transformation cycle.

CuZnAl; shape memory; transformation temperatures

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