Aging behavior of the Ti-29Nb-13Ta-4.6Zr new beta alloy for medical implants |
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| Authors: | Masahiko Ikeda Shin-Ya Komatsu Isao Sowa Mitsuo Niinomi |
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| Affiliation: | (1) Present address: the Department of Materials Science and Engineering, Faculty of Engineering, Kansai University, 564-8680 Osaka, Japan;(2) Kyoei Steel Ltd., 530-0004 Osaka, Japan;(3) the Department of Production Systems Engineering, Toyohashi University of Technology, 441-8580 Toyohashi, Japan |
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| Abstract: | The aging behavior of the Ti-29Nb-13Ta-4.6Zr alloy quenched from 1033 K was investigated by employing electrical resistivity
(ρ) and Vickers hardness (HV) measurements, optical microscopy (OM), and X-ray diffraction (XRD). Upon aging at 573 K, the ρ value at room- and liquid-nitrogen temperatures initially increased to 120 and 30 ks, respectively, and decreased with continued
aging time. The HV value started to increase from 0.06 ks and the isothermal ω phase was identified at 300 ks of aging by XRD. On aging at 773 K, an incubation period of 6 ks was observed for the ρ change at both temperatures, following which ρ decreased. An incubation period for the HV change was extended up to 12 ks, and then HV increased. Precipitated α was observed and identified by OM and XRD, respectively, whereas no reflections of isothermal ω phase were identified during the whole aging time at 773 K. The upper-limit temperature of isothermal ω precipitation is situated at around 673 K. |
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