Martensitic transformation and shape memory properties of Ti–Ta–Sn high temperature shape memory alloys

► Sn is effective for improving stability of shape memory effect of Ti–Ta alloys. ► High martensitic transformation temperature can be achieved in Ti–Ta–Sn alloys. ► The addition of Sn increases the transformation strain. The effects of Ta and Sn contents on the martensitic transformation temperatur...

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Bibliographic Details
Published in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 528; no. 24; pp. 7238 - 7246
Main Authors:	Kim, Hee Young, Fukushima, Tatsuhito, Buenconsejo, Pio John S., Nam, Tae-hyun, Miyazaki, Shuichi
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier B.V 15-09-2011 Elsevier
Subjects:	Aging Alloys Binary alloys Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science; rheology Exact sciences and technology Martensitic transformations Materials science Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Physics Shape memory alloys Tantalum Thermal cycling Thermal expansion; thermomechanical effects and density Thermal properties of condensed matter Thermal properties of crystalline solids Tin Titanium alloys Titanium base alloys Aging Titanium alloys Shape memory alloys Martensitic transformations Structure stability Thermal ageing Thermal cycle High temperature Thermal stability Shape memory effects Thermal properties Tin additions Binary alloys Phase stability Thermodynamic properties Thermal cycling Recovery (properties) Crystal structure
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Summary:	► Sn is effective for improving stability of shape memory effect of Ti–Ta alloys. ► High martensitic transformation temperature can be achieved in Ti–Ta–Sn alloys. ► The addition of Sn increases the transformation strain. The effects of Ta and Sn contents on the martensitic transformation temperature, crystal structure and thermal stability of Ti–Ta–Sn alloys are investigated in order to develop novel high temperature shape memory alloys. The martensitic transformation temperature significantly decreases by aging or thermal cycling due to the formation of ω phase in the Ti–Ta binary alloys. The addition of Sn is effective for suppressing the formation of ω phase and improves stability of shape memory effect during thermal cycling. The amount of Sn content necessary for suppressing aging effect increases with decreasing Ta content. High martensitic transformation temperature with good thermal stability can be achieved by adjustment of the Ta and Sn contents. Furthermore, the addition of Sn as a substitute of Ta with keeping the transformation temperature same increases the transformation strain in the Ti–Ta–Sn alloys. A Ti–20Ta–3.5Sn alloy reveals stable shape memory effect with a martensitic transformation start temperature about 440 K and a larger recovery strain when compared with a Ti–Ta binary alloy showing similar martensitic transformation temperature.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0921-5093 1873-4936
DOI:	10.1016/j.msea.2011.06.021