Microstructure and fatigue behaviors of a biomedical Ti–Nb–Ta–Zr alloy with trace CeO2 additions
Microstructure and fatigue behaviors of a biomedical Ti–Nb–Ta–Zr alloy with trace CeO2 additions
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添加微量 CeO2 的生物医用 Ti-Nb-Ta-Zr 合金的显微组织和疲劳行为
DOI：
10.1016/j.msea.2014.09.069
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发表时间：
2014-12
期刊：
影响因子：
6.4
通讯作者：
Miaoyong Zhu
中科院分区：
文献类型：
--
作者：
Mitsuo Niinomi;Masaaki Nakai;Yang Liu;Miaoyong Zhu
添加微量CeO 2的新型β型Ti-29 Nb-13 Ta-4.6Zr（TNTZ）合金被设计为生物医学植入物，通过保持较低的杨氏模量来改善疲劳性能。结果表明：CeO 2的加入细化了合金的组织，当Ce含量从0.05%增加到0.10%时，β晶粒尺寸略有增大。这是因为分散的CeO 2颗粒可以作为β晶粒的形核点，因此稀土氧化物对显微组织的细化作用主要取决于稀土氧化物的尺寸和分散度。添加CeO 2的TNTZ的杨氏模量与不添加CeO 2的TNTZ的杨氏模量一样低，而疲劳极限得到了很大的提高。0.10%Ce合金具有最好的疲劳强度的实验合金中，其疲劳强度提高了66.7%，相比纯TNTZ。稀土氧化物影响疲劳性能的机制主要是弥散强化。坚硬的稀土氧化物可以阻碍位错的运动，从而抵抗疲劳裂纹的形成。稀土氧化物还改变了裂纹扩展方向和裂纹扩展路径，有效地降低了裂纹扩展速率。
The new β-type Ti–29Nb–13Ta–4.6Zr (TNTZ) alloy containing trace amounts of CeO2additions has been designed as a biomedical implant with improved fatigue properties achieved by keeping Young׳s modulus to a low value. The results show that the microstructure is refined by the addition of CeO2; the β grain size becomes a little larger when Ce content increases from 0.05% to 0.10%. This occurs because dispersed CeO2particles can act as nucleation sites for β grains; thus, the effect of rare earth oxides on microstructure refinement mainly depends on the size and dispersion of the rare earth oxides. Young׳s moduli of TNTZ with CeO2additions are maintained as low as those of TNTZ without CeO2, while the fatigue limit is highly improved. The 0.10% Ce alloy exhibits the best fatigue strength among the experimental alloys; its fatigue strength is increased by 66.7% compared to that of pure TNTZ. The mechanism by which rare earth oxides affect fatigue performance is dominated by dispersion strengthening. The stiff rare earth oxides can hinder the movement of dislocations, resulting in resistance to the formation of fatigue cracks. Rare earth oxides also change the crack propagation direction and the crack propagation route, effectively decreasing the crack propagation rate.
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影响因子：
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