Improvement in Fatigue Strength of Biomedical β-type Ti–Nb–Ta–Zr Alloy While Maintaining Low Young’s Modulus Through Optimizing ω-Phase Precipitation
Improvement in Fatigue Strength of Biomedical β-type Ti–Nb–Ta–Zr Alloy While Maintaining Low Young’s Modulus Through Optimizing ω-Phase Precipitation
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通过优化 ω 相析出，在保持低杨氏模量的同时提高生物医学 β 型 Ti-Nb-Ta-Zr 合金的疲劳强度
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发表时间：
2011
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通讯作者：
Takahiro Oneda
中科院分区：
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作者：
M. Nakai;M. Niinomi;Takahiro Oneda
研究了Ti-29Nb-13Ta-4.6Zr （TNTZ）生物医用β型钛合金在保持低杨氏模量的情况下，通过热处理提高疲劳强度的方法。在ω相成形温度下采用短时效结合冷轧工艺。在经过这种热处理的TNTZ中观察到一个精细的ω相。由于β相的轧制织构是由冷轧形成的，如ω相可能优先取向于有效抑制杨氏模量增加的方向。冷轧后在573 K（300℃）时效3.6和10.8 ks的样品在高拉伸强度和低杨氏模量之间表现出良好的平衡。在时效3.6 ks的情况下，试样的抗拉强度有所提高，但疲劳强度没有明显提高。经10.8 ks时效处理后，试样的抗拉强度和疲劳强度均有提高。这种疲劳强度是目前和以前研究中使用的TNTZ样品中最高的，杨氏模量小于80 GPa。
The improvement in fatigue strength, with maintenance of a low Young’s modulus, in a biomedical β-type titanium alloy, Ti–29Nb–13Ta–4.6Zr (TNTZ), by thermomechanical treatment was investigated. A short aging time at an ω-phase-forming temperature combined with severe cold rolling was employed. A fine ω phase is observed in TNTZ subjected to this thermomechanical treatment. Because the rolling texture of β phase is formed by cold rolling, such as the ω phase may be preferentially oriented to a direction that is effective for inhibiting the increase in Young’s modulus. The samples aged at 573 K (300 °C) for 3.6 ks and 10.8 ks after cold rolling exhibit a good balance between a high tensile strength and low Young’s modulus. In the case of the sample aged for 3.6 ks, the tensile strength is improved, although the fatigue strength is not improved significantly. Both the tensile strength and the fatigue strength of the sample aged for 10.8 ks are improved. This fatigue strength is the highest among the TNTZ samples used in the current and in previous studies with Young’s moduli less than 80 GPa.