TiPt–Co and TiPt–Ru high temperature shape memory alloys

Equiatomic TiPt exhibits very high transformation temperatures (~1300 K) from B2 to B19 orthorhombic martensitic phase. However TiPt exhibits negligible (~0–11%) shape memory effect and low strength (~450 MPa) in martensite and very low strength (~20 MPa) in B2 phase region. Then in this study, we compared the high temperature strength and shape memory properties of Ti–50Pt by partial substitution of Platinum (Pt) belonging to group 10 of periodic table with Cobalt (Co) belonging to group 9 and Ruthenium (Ru) belonging to group 8 of periodic table respectively. Partial substitution of Pt with Co and Ru was found effective in improving the high temperature strength and shape memory properties of Ti–50Pt alloy. However partial substitution of Pt with Ru was found more effective than Co due to more effective solid solution strengthening effect. Ti–45Pt–5Co and Ti–45Pt–5Ru alloys have potential for high temperature shape memory materials applications.