Effects of aging on martensitic transformation of Ti50Ni25Cu25 shape memory alloy

Abstract Martensitic transformation has been studied in Ti 50 Ni 25 Cu 25 shape memory alloy by internal friction (IF) measurement and X-ray diffraction. It shows that the martensitic transformation proceeds from B2 to B19 for the solution-treated Ti 50 Ni 25 Cu 25 alloy. B2 phase is stabilized, and aging the alloy at 723–923 K decreases internal friction values. Part of the remaining B2 parent phase transform to B19′ monoclinic martensite at much lower temperatures.