Effect of Nb Content on Deformation Textures and Mechanical Properties of Ti-18Zr-Nb Biomedical Alloys
Effect of Nb Content on Deformation Textures and Mechanical Properties of Ti-18Zr-Nb Biomedical Alloys
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DOI：
10.2320/matertrans.ma200908
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发表时间：
2008
影响因子：
1.2
通讯作者：
H. Tobe;H. Y. Kim;S. Miyazaki
中科院分区：
文献类型：
--
作者：
H. Tobe;H. Y. Kim;S. Miyazaki
近年来，由Nb、Ta、Zr、Mo和Sn等无毒元素组成的β型钛合金已被研究用于生物医学应用。本课题组还开发了包括Ti-Zr-Nb合金在内的新型生物医用超弹性材料。它们揭示了在热机械加工过程中形成的强烈织构，并导致机械性能的各向异性。研究了Nb含量对Ti-18 Zr-Nb合金形变织构的影响。研究了Ti-18 Zr-Nb合金力学性能的各向异性。采用氩弧熔炼法制备Ti-18 Zr-（15 <$18）Nb（at%）合金铸锭，并在1273 K保温7.2 ks进行均匀化处理。将铸锭冷轧，厚度减少高达99%。对于轧制态合金，Ti-18 Zr-（15，16）Nb合金中观察到较弱的γ纤维织构，而Ti-18 Zr-18 Nb合金中观察到较发达的{001}织构。前一种合金由于弱织构而表现出弱的各向异性，而后一种合金由于强织构而表现出强的各向异性。
Recently, β-type Ti alloys composed of non-toxic elements such as Nb, Ta, Zr, Mo and Sn have been studied for biomedical applications. The present author’s research group has also developed these alloys including Ti-Zr-Nb as new biomedical superelastic materials. They reveal strong textures which are formed during thermo-mechanical processing and cause the anisotropy in mechanical properties. In this study, the effect of Nb content on the deformation texture of Ti-18Zr-Nb alloys was investigated. The anisotropy in mechanical properties of Ti-18Zr-Nb alloys was also investigated. Ti-18Zr-(15∼18)Nb (at%) alloy ingots were fabricated by an Ar arc melting method and then homogenized at 1273 K for 7.2 ks. The ingots were cold rolled with a reduction up to 99% in thickness. For the as-rolled alloys, a weak γ-fiber texture was observed in Ti-18Zr-(15, 16)Nb alloys, whereas a well developed {001}〈110〉 texture was confirmed in the Ti-18Zr-18Nb alloy. The former alloys revealed weak anisotropy in Young’s modulus due to the weak texture, while the latter alloy exhibited strong anisotropy due to the strong texture.