Investigation of Ti-Pt-V high temperature shape memory alloys towards aerospace applications: A cluster expansion screening

TiPt has a higher martensitic transformation above 1200 K, which makes it a good candidate for HTMSAs. However, TiPt exhibits C′ = -32GPa. A new class of Ti-Pt-V systems was predicted using cluster expansion. It was found that the density of the system decreases with the addition of V and the heats of formation was found to be -0.352 eV/atom, suggesting thermodynamical stability. The mechanical behaviour of Ti2VPt alloy revealed that it is mechanically stable. The phonon dispersion curves confirmed vibrational stability due to the absence of soft modes. This work suggests that the addition of V stabilises and improves the mechanical characteristics of the Ti-Pt alloys.