日本金属学会誌

J. Japan Inst. Metals, Vol. 67, No. 11 (2003),
pp. 652-660

Effects of Thermomechanical Processings on Fatigue Properties of Ti-29Nb-13Ta-4.6Zr for Biomedical Applications

Toshikazu Akahori1, Mitsuo Niinomi1, Keita Ishimizu1,, Hisao Fukui2 and Akihiro Suzuki3

1Department of Production Systems Engineering, Toyohashi University of Technology, Toyohashi 441-8580
2School of Dentistry, Aichi-Gakuin University, addressNagoya 464-8650

3Titanium Division , Daido Steel Co., LTD., Tokyo 105-8403

Abstract:

Fatigue properties of Ti-29Nb-13Ta-4.6Zr underwent various thermomechanical processings were investigated in order to establish the optimal thermomechanical processing conditions for getting excellent fatigue properties.

Precipitated α phase in Ti-29Nb-13Ta-4.6Zr aged at 673 K for 259.2 ks after cold rolling presents very fine needlelike phase as compared with precipitated α phase in Ti-29Nb-13Ta-4.6Zr aged at 673 K for 259.2 ks after solution treatment at 1063 K for 3.6 ks or aged at 723 K for 259.2 ks after cold rolling. Ti-29Nb-13Ta-4.6Zr aged at 723 K for 259.2 ks after cold rolling shows the greatest fatigue strength in both low cycle fatigue and high cycle fatigue life regions, and the fatigue limit, which is around 770 MPa, is nearly equal to that of hot-rolled Ti-6Al-4V ELI with equiaxed α structure.}


(Received May 14, 2003)

Keywords:

biomaterial, β-type titanium alloy, titanium-29 mass%niobium-13 mass%tantalum-4.6 mass%zirconium, thermomechanical processing, microstructure, tensile properties and fatigue properties


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