Effect of Nb on Microstructural Characteristics of Ti-Nb-Ta-Zr Alloy for Biomedical Applications

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  • Li Shujun
    Institute of Metal Research, Chinese Academy of Sciences
  • Hao Yulin
    Institute of Metal Research, Chinese Academy of Sciences
  • Yang Rui
    Institute of Metal Research, Chinese Academy of Sciences
  • Cui Yuyou
    Institute of Metal Research, Chinese Academy of Sciences
  • Niinomi Mitsuo
    Department of Production Systems Engineering, Toyohashi University of Technology

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Abstract

The effects of several commonly used heat treatment schemes on the microstructures of two Ti–Nb–Ta–Zr alloys aimed at biomedical applications were studied in this work using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The specimens were water quenched from 790°C and then aged at temperatures between 300°C and 600°C. The experimental results showed that α and ω phase precipitated from the metastable β matrix in Ti–29Nb–13Ta–4.6Zr alloy during isothermal ageing. But for Ti–39Nb–13Ta–4.6Zr, the precipitation reaction was more sluggish than that in Ti–29Nb–13Ta–4.6Zr because of high amount of β stabilizing elements in the former alloy. As a result the α phase was unable to precipitate during short time ageing treatment. After longer time (12 days) ageing treatment at 500°C or 400°C, recognizable α precipitates were observed in the aged samples. It is concluded that Ti–29Nb–13Ta–4.6Zr can be heat treated to obtain different microstructures and is better than Ti–39Nb–13Ta–4.6Zr in terms of age hardenability.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 43 (12), 2964-2969, 2002

    The Japan Institute of Metals and Materials

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