日本金属学会誌

J. Japan Inst. Metals, Vol. 70, No. 7 (2006),
pp. 572-578

Analysis of Tensile Deformation Behaviors of Ti-XNb-10Ta-5Zr Alloys for Biomedical Applications

Nobuhito Sakaguchi1,, Mitsuo Niinomi2, Toshikazu Akahori2 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-XNb-10Ta-5Zr alloys were fabricated based on Ti-30Nb-10Ta-5Zr alloy, which was the composition that simplified that of Ti-29Nb-13Ta-4.6Zr alloy for biomedical applications. The tensile deformation mechanisms of the Ti-25Nb-10Ta-5Zr, Ti-30Nb-10Ta-5Zr, and Ti-35Nb-10Ta-5Zr alloys were investigated using X-ray diffraction analysis under several loading conditions.
Under loading conditions, the X-ray diffraction peaks of all specimens in this study shift to higher angles than those obtained under non-loading conditions. In the crystal orientation of Ti-30Nb-10Ta-5Zr alloy, in which the lattice strain has reached the maximum elastic lattice strain, plastic deformation (for example slip) is moved with elastic deformation. Therefore, the elastic modulus of this alloy appears to decrease in terms of strain over a proportional limit. Thus, the elastic deformation behavior of the Ti-30Nb-10Ta-5Zr alloy does not obey Hooke's law.


(Received 2005/10/21)

Keywords:

beta type titanium alloy, elastic plastic deformation, elastic strain, X-ray analysis, biomaterial, powder metallurgy


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