Improvement in fatigue characteristics of newly developed beta type titanium alloy for biomedical applications by thermo-mechanical treatments
Improvement in fatigue characteristics of newly developed beta type titanium alloy for biomedical applications by thermo-mechanical treatments
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DOI：
10.1016/j.msec.2004.12.007
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发表时间：
2005-05-01
期刊：
影响因子：
--
通讯作者：
Toda, H
中科院分区：
文献类型：
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作者：
Akahori, T;Niinomi, M;Toda, H
对经过不同热机械处理的P型钛合金Ti-29 Nb-13 Ta-4.6Zr的拉伸和平面疲劳性能进行了研究，Ti-29 Nb-13 Ta-4.6Zr（TNTZ）合金的显微组织冷轧后直接在723 K时效259.2 ks和固溶处理后在723 K时效259.2 ks的TNTZ均由β相中析出的α相组成。冷轧后直接在598 K和673 K时效259.2 ks和固溶处理后在598 K和673 K时效259.2 ks的TNTZ组织分别由析出的Ω相和β相中析出的α相和Ω相组成。随着时效温度的升高，固溶处理后的时效TNTZ和冷轧后的时效TNTZ的抗拉强度降低，而伸长率则相反。由ω相或β相中的ω相和α相组成的TNTZ显示出约1000 MPa或更高的拉伸强度。固溶处理后的时效TNTZ和冷轧后的时效TNTZ的杨氏模量随时效温度的升高而降低。用溶液处理进行的TNTZ具有约60 GPa的最低杨氏模量。固溶处理后的时效TNTZ和冷轧后的时效TNTZ的疲劳强度随着时效温度的升高而增加。特别地，冷轧后在723 K下直接时效的TNTZ在低周疲劳寿命和高周疲劳寿命区域中均显示出最大的疲劳强度，并且疲劳极限（约770 MPa）几乎等于进行时效的热轧Ti-6Al-4V ELI的疲劳极限，热轧Ti-6Al-4V ELI是用于生物医学应用的代表性α + β型钛合金之一。(c)2005 Elsevier B. V.保留所有权利。
Tensile and plain fatigue properties of P type titanium alloy, Ti-29Nb-13Ta-4.6Zr, which underwent various thermo-mechanical treatments, were investigated in order to judge its potential for biomedical applications.Microstructures of Ti-29Nb-13Ta-4.6Zr (TNTZ) aged directly at 723 K for 259.2 ks after cold rolling and TNTZ aged at 723 K for 259.2 ks after solution treatment are composed of precipitated alpha phase in beta phase. While, microstructures of TNTZ aged directly at 598 K and 673 K for 259.2 ks after cold rolling and aged at 598 K and 673 K for 259.2 ks after solution treatment are composed of precipitated omega phase, and precipitated alpha and omega phases in beta phase, respectively. Tensile strength of aged TNTZ after solution treatment and aged TNTZ after cold rolling decreases with increasing aging temperature although the elongation shows the reverse trend. TNTZ composed of omega phase or omega and alpha phases in beta phase shows the tensile strength of around 1000 MPa or more. Young's moduli of aged TNTZ after solution treatment and aged TNTZ after cold rolling decrease with increasing aging temperature. TNTZ conducted with solution treatment has the lowest Young's modulus of around 60 GPa. Fatigue strengths of aged TNTZ after solution treatment and aged TNTZ after cold rolling increase with increasing aging temperature. In particular, TNTZ aged directly at 723 K after cold rolling shows the greatest fatigue strength in both low cycle fatigue life and high cycle fatigue life regions, and the fatigue limit, which is around 770 MPa, is nearly equal to that of hot-rolled Ti-6Al-4V ELI conducted with aging, which is one of representative alpha + beta type titanium alloys for biomedical applications. (c) 2005 Elsevier B.V. All rights reserved.