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QAge-hardening behavior, microstructural evolution and grain growth kinetics of isothermal w phase of Ti-Nb-Ta-Zr-Fe alloy for biomedical applications

机译：生物医学应用Ti-Nb-Ta-Zr-Fe合金等温w相的QAge硬化行为，显微组织演变和晶粒长大动力学

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摘要

Age-hardening behavior, microstructural evolution and the grain growth kinetics of isothermal to during aging treatments of Ti-25Nb-10Ta-lZr-0.2Fe alloy were investigated. The results showed that in addition to martensite α", a small amount of α and athermal ω was observed in the β matrix after solution treatment. The decomposition of martensite α" and the transformation from athermal ω (ω_ath) to isothermal ω (ω_iso) occurred at the early stage of aging. _iso firstly competed to grow with α phase, and then dissolved and transformed into a phase. The growth and dissolution of ω)_iso was accelerated with increasing aging temperature. Finally, the α +β stable microstructure was obtained after aging for 280,200,24 and 2 h at 623, 673, 743 and 773 K, respectively. The alloy showed stronger age-hardening response at intermediate temperatures of 673 and 743 K, while exhibited weaker age-hardening response at lower temperature of 623 K and higher temperature of 773 K. The uniform distribution of dense ω_iso and α precipitates in the β matrix with moderate size resulted in the peak micro-hardness values. The grain growth of ω_iso obeys an asymptotic law, and the grain-growth exponent, n, was computed to be in the range of 0.23-0.26 at temperatures in the range of 623-743 K. The activation energy for ω_iso grain growth, Q_g was calculated to be 119.7 kJ/mol.
机译：研究了Ti-25Nb-10Ta-1zr-0.2Fe合金时效时效行为的时效行为，微观组织演变和等温晶粒生长动力学。结果表明，固溶处理后的β基体中除了马氏体α“外，还观察到少量的α和无热ω。马氏体α”的分解和从无热ω（ω_ath）转变为等温ω（ω_iso）发生在衰老的早期。 _iso首先竞争以α相生长，然后溶解并转变为相。随着时效温度的升高，ω）_iso的生长和溶解加快。最后，在623、673、743和773 K分别老化280,200,24和2 h后，获得了α+β稳定的微观结构。该合金在673和743 K的中间温度下表现出较强的时效硬化响应，而在623 K的较低温度和773 K的较高温度下表现出较弱的时效硬化响应。致密的ω_iso和α均匀分布在β基体中中等大小的材料会产生显微硬度峰值。 ω_iso晶粒长大遵循一个渐近律，在623-743 K的温度范围内，晶粒长大指数n在0.23-0.26范围内。ω_iso晶粒长大的活化能Q_g计算为119.7 kJ / mol。

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  • 来源
    《Materials Science and Engineering》 |2011年第2011期|p.326-334|共9页
  • 作者

    Y.F. Xu; D.Q Yi; H.Q. Liu; B. Wang; F.L Yang;

  • 作者单位

    School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China,Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan, 411105, PR China;

    School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China,Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan 410083, PR China,;

    School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China,Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan, 411105, PR China,Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan 410083, PR China,;

    School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China,Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan 410083, PR China,;

    School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China,Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan 410083, PR China,;

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  • 正文语种 eng
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  • 关键词

    age-hardening microstructural evolution grain growth kinetics ω phase;

    机译：时效硬化;显微组织演变;晶粒长大动力学;ω相;

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