Thermal cycle stability of Co64V15Si17Al4 high-temperature shape memory alloy

•A L21/D022 martensitic transformation is observed in Co64V15Si17Al4 alloy.•The Ms and As are high reach up to 589.6 °C and 649.1 °C in the alloy, respectively.•The addition of Al prevents the decomposition of the austenite phase.•The alloy shows high thermal stability upon cycling up to 200 thermal cycles. The microstructure, martensitic transformation and thermal cycle stability of Co64V15Si17Al4 high-temperature shape memory alloy were studied. The results show that the martensite transformation of L21/D022 occurred in the Co64V15Si17Al4 alloy. In the Co64V15Si17Al4 alloy, the transformation temperatures of forward transformation and reverse transformation are pretty high, reaching 589.6 °C and 649.1 °C, respectively. The temperatures of the martensitic transformation and the transformation heat show a neglectable difference after 200 thermal cycles in the alloy. This alloy exhibits good thermal stability during 200 thermal cycles between room temperature and 850 °C, in which the microstructure and martensitic transformation behavior have no obvious change.