Fatigue characteristics of a biomedical β-type titanium alloy with titanium boride
Fatigue characteristics of a biomedical β-type titanium alloy with titanium boride
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硼化钛生物医用β型钛合金的疲劳特性
DOI：
10.1016/j.msea.2015.05.078
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发表时间：
2015-07
期刊：
影响因子：
6.4
通讯作者：
Yang Liu
中科院分区：
文献类型：
--
作者：
Lei Wang;Mitsuo Niinomi;Masaaki Nakai;Yang Liu
开发了一种含有不同TiB增强量的β型Ti-29Nb-13Ta-4.6Zr （TNTZ）合金，用于生物医学应用，以获得更高的疲劳强度。在室温下进行了疲劳试验，研究了TiB对疲劳裂纹萌生和扩展的影响。结果表明，TiB增强能显著提高TNTZ合金的疲劳极限。随着B浓度的增加，材料的疲劳强度先升高后降低。含0.10% B的TNTZ合金的疲劳极限最大，比TNTZ合金的疲劳极限高67%。TiB对疲劳性能的改善有以下两个因素。首先，TiB颗粒可以阻止位错的滑动，从而抵抗疲劳裂纹萌生；此外，TiB颗粒的裂纹偏转和裂纹桥接作用可以延缓裂纹扩展。相反，当B浓度高于0.20%时，可能会出现较大的TiB颗粒脱粘。因此，裂纹起源于TiB颗粒的脱粘，并容易沿界面脱粘产生的空洞扩展，从而对疲劳强度产生不利影响。
A β-type Ti–29Nb–13Ta–4.6Zr (TNTZ) alloy containing various amounts of TiB reinforcements has been developed to achieve higher fatigue strength for biomedical applications. Fatigue tests were performed at room temperature, and the effects of TiB on fatigue crack initiation and propagation were investigated. The results indicate that the fatigue limit of the TNTZ alloy was substantially improved by the TiB reinforcements. However, the fatigue strength first increased and subsequently decreased as the B concentration increased. TNTZ alloy with 0.10% B has the largest fatigue limit, which is 67% greater than that of the TNTZ alloy. The effects of TiB on the improvement of the fatigue properties are due to the following two factors. First, sliding of the dislocations can be blocked by TiB particles, which results in resistance to fatigue crack initiation. In addition, the crack deflection and crack bridging by the TiB particles could delay the crack propagation. Conversely, debonding of some larger TiB particles may occur, especially when the B concentration is higher than 0.20%. Therefore, the crack initiates from the debonding of the TiB particles and easily propagates along the voids from the interfacial decohesion, which could exert a deleterious influence on the fatigue strength.
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DOI：
10.1016/j.msea.2011.03.108
发表时间：
2011-06
影响因子：
6.4
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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影响因子：
6
作者：
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通讯作者：
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