日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 654-658

Effects of Sn Content and Aging Conditions on Superelasticity in Biomedical Ti-Mo-Sn Alloys

Takashi Maeshima1,, Satoshi Ushimaru1,\footnotemark[1], Kiyoshi Yamauchi2 and Minoru Nishida3

1Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555
2Biomedical Engineering Research Organization, Tohoku University, Sendai 980-8579
3Department of Materials Science and Engineering, Kumamoto Unversity, Kumamoto 860-8555

Abstract:

The effects of Sn content and aging conditions on superelasticity in Ti-Mo-Sn alloys were investigated. Martensitic transformation temperature decreased with an increasing of Sn content. A large superelastic strain of 3.0% was obtained in a solution-treated Ti-5 mol%Mo-5 mol%Sn alloy in the tensile test. The superelasticity in the Ti-5 mol%Mo-5 mol%Sn at room temperature was improved by aging at 873 K for short periods between 180 and 420 s. A specimen aged at 873 K for 300 s exhibited superelasticity with a recovery strain of 3.5% in the tensile test. A recovery strain of 3.0% was consistently achieved in cyclic tensile deformations.


(Received 2005/2/21)

Keywords:

β-titanium alloy, titanium-molybdenum-tin, tin content, heat treatment, superelasticity, martensitic transformation, smart biomaterial


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