日本金属学会誌

J. Japan Inst. Metals, Vol. 70, No. 1 (2006),
pp. 89-95

Tensile Deformation Behavior of Ti-30Nb-10Ta-XZr Alloys for Biomedical Applications

Nobuhito Sakaguchi1,, Mitsuo Niinomi2, Toshikazu Akahori1 and Hiroyuki Toda1

1Department of Production Systems Engineering, Toyohashi University of Technology, Toyohashi 441-8580
2Institute for Materials Research, Tohoku University, Sendai 980-8577

Abstract:

Ti-30Nb-10Ta-XZr alloys were fabricated based on Ti-30Nb-10Ta-5Zr alloy, which was the composition simplified that of Ti-29Nb-13Ta-4.6Zr alloy for biomedical applications. The tensile deformation mechanisms of Ti-30Nb-10Ta-XZr alloys (X: 0, 3, 5, 7 and 10%) were then investigated.
The plastic deformation mechanisms of Ti-30Nb-10Ta-XZr alloys during tensile loading change with changing Zr content. Microstructure of Ti-30Nb-10Ta alloy without Zr after tensile test shows a stress-induced transformation of β phase. In Ti-30Nb-10Ta alloy, the plastic deformation mechanism is mainly dominated by the stress-induced transformation of β phase. Microstructure of Ti-30Nb-10Ta-3Zr alloy after tensile test shows a stress-induced transformation of β phase and many dislocations in β phase. In Ti-30Nb-10Ta-3Zr alloy, the plastic deformation mechanism is mainly dominated by the stress-induced transformation of β phase and slip. Microstructures of Ti-30Nb-10Ta-XZr alloys (X: 5, 7 or 10%) after tensile test show many dislocations in β phase. In these alloys, the plastic deformation mechanisms are mainly dominated by slip. The elastic deformations of Ti-30Nb-10Ta-XZr alloys (X: 3, 5 or 7%) do not depend on Hooke's law. The maximum recovery strains of these alloys increase with increasing the total strain.


(Received 2005/8/8)

Keywords:

titanium alloy, mechanical properties, stress-induced transformation, microstructure, biomaterial, powder metallurgy


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