Effect of solution treatment on the microstructure and reverse martensitic transformation behavior of a novel porous CuAIMn shape memory alloy

摘要

A novel porous CuAIMn shape memory alloy (SMA) has been successfully fabricated by sintering-dissolution process. Effect of solution treatment on the microstructure and the reverse martensitic transformation (MT) behavior of the resulting specimens are investigated by means of SEM, optical microscope, DSC and internal friction (IF). The results show that with increasing solution temperature, the content and the size as well as the arrangement order of martensite in matrix increase. The reverse MT behavior follows different dependences on solution temperature and solution time at different temperature ranges. The related mechanisms are discussed in terms of the changes of the content of martensite and the concentration of quenched-in vacancies.