Aging response of the young’s modulus and mechanical properties of Ti-29Nb-13Ta-4.6Zr for biomedical applications |
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Authors: | Y L Hao R Yang M Niinomi D Kuroda Y L Zhou K Fukunaga A Suzuki |
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Affiliation: | (1) the Institute of Metal Research, Chinese Academy of Sciences, 110016 Shenyang, People’s Republic of China;(2) the Department of Production Systems Engineering, Toyohashi University of Technology, 441-8580 Toyohashi, Japan;(3) the Corrosion/Heat-Resistant Alloy Research Section, Research and Development Division, Daido Steel Co. Ltd., 457-8545 Nagoya, Japan |
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Abstract: | Alloys for implant devices require improved strength but a reduced Young’s modulus, in order to become mechanically more compatible
with adjacent bone tissues. In this study, a new metastable β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (wt pct), was subjected to aging treatment to produce different microstructures,
and the resulting mechanical properties, including the Young’s modulus, were measured. The Young’s modulus of this alloy is
found to be sensitive to microstructures generated by various heat treatments. For microstructures varying from (α + β) to (α + β + ω) and (β + ω), the Young’s modulus increases with an accompanying increase in tensile strength and hardness, but decreases in ductility.
The (β + ω) microstructure has a low strength, high modulus, and poor ductility and cannot be used for biomedical applications. For
an (α + β) microstructure, the volume fraction of the phases is shown to be the main factor that determines the mechanical properties. |
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