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

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 601; pp. 106 - 110
• Main Authors: Wadood, Abdul, Yamabe-Mitarai, Yoko
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 17.04.2014; Elsevier
• Subjects: Applied sciences; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Crystal structure; Exact sciences and technology; Martensite; Martensitic transformations; Materials science; Mechanical properties; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Shape memory effect; Solid solution, precipitation, and dispersion hardening; aging; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; TiPt–X; Treatment of materials and its effects on microstructure and properties; Mechanical properties; Martensite; TiPt–X; Shape memory effect; Crystal structure; TiPt-X; Shape memory material; Ruthenium; Intermetallic compounds; Martensitic phase; Martensitic transformations; High temperature; Cobalt; Solid solution hardening; Shape memory effects; Platinum; Orthorhombic lattices
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2014.02.029

Equiatomic TiPt exhibits very high transformation temperatures (~1300K) from B2 to B19 orthorhombic martensitic phase. However TiPt exhibits negligible (~0–11%) shape memory effect and low strength (~450MPa) in martensite and very low strength (~20MPa) 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.