Abstract
The improvement in fatigue strength, with maintenance of a low Young’s modulus, in a biomedical β-type titanium alloy, Ti–29Nb–13Ta–4.6Zr (TNTZ), by thermomechanical treatment was investigated. A short aging time at an ω-phase-forming temperature combined with severe cold rolling was employed. A fine ω phase is observed in TNTZ subjected to this thermomechanical treatment. Because the rolling texture of β phase is formed by cold rolling, such as the ω phase may be preferentially oriented to a direction that is effective for inhibiting the increase in Young’s modulus. The samples aged at 573 K (300 °C) for 3.6 ks and 10.8 ks after cold rolling exhibit a good balance between a high tensile strength and low Young’s modulus. In the case of the sample aged for 3.6 ks, the tensile strength is improved, although the fatigue strength is not improved significantly. Both the tensile strength and the fatigue strength of the sample aged for 10.8 ks are improved. This fatigue strength is the highest among the TNTZ samples used in the current and in previous studies with Young’s moduli less than 80 GPa.
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Acknowledgments
This work was supported financially in part by the Global COE Program “Materials Integration International Center of Education and Research, Tohoku University” from Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan; the Inter-University Cooperative Research Program “Highly-functional Interface Science: Innovation of Biomaterials with Highly-Functional Interface to Host and Parasite, Tohoku University and Kyushu University” from MEXT of Japan; and the Industrial Technology Research Grant Program in 2009 from the New Energy and Industrial Technology Development Organization (NEDO) of Japan.
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Manuscript submitted January 31, 2011.
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Nakai, M., Niinomi, M. & Oneda, T. Improvement in Fatigue Strength of Biomedical β-type Ti–Nb–Ta–Zr Alloy While Maintaining Low Young’s Modulus Through Optimizing ω-Phase Precipitation. Metall Mater Trans A 43, 294–302 (2012). https://doi.org/10.1007/s11661-011-0860-3
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DOI: https://doi.org/10.1007/s11661-011-0860-3