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Phase decomposition of liquid-quenched β-type Ti-Cr alloys

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Abstract

Phase decomposition behaviour of liquid-quenched β (bcc) type Ti-Cr alloys was investigated by means of transmission electron microscopy and hardness measurements. It was found that decomposition of β to β1 (Ti-rich, bcc) + β2 (Ti-lean, bcc) takes place in the intermediate composition range of the Ti-Cr system. This experimental result proves the theoretical prediction made by Menon and Aaronson, but the observed β1 + β2 two-phase field expands towards higher temperatures than the predicted binodal line. The coherent β1 + β2 two-phase state exhibits the so-called 〈100〉 modulated structure and it was concluded that the formation of such a structure is a result of spinodal decomposition of the β-phase. We obtained time-temperature-transformation (TTT) diagrams of β-type Ti-30, 40 and 50 at % Cr alloys. A typical sequence of structural change is β → coherent β1 + β2 → incoherent β1 + β2 → incoherent β1 + β2 + grain boundary precipitates → stable state of β + TiCr2 or α + TiCr2. Not all the states in the above sequence appear, depending on alloy composition, liquid-quenching rate and ageing temperature.

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Author notes

  1. Yoichi Ikematsu

    Present address: R and D Laboratories-I, Nippon Steel Corporation, 211, Kawasaki, Japan

Authors and Affiliations

  1. Department of Materials Science and Engineering, Metals Section, Nagoya Institute of Technology, Gokiso-Cho, Showa-Ku, 466, Nagoya, Japan

    Yoichi Ikematsu, Minoru Doi & Toru Miyazaki

Authors
  1. Yoichi Ikematsu
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  2. Minoru Doi
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  3. Toru Miyazaki
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Ikematsu, Y., Doi, M. & Miyazaki, T. Phase decomposition of liquid-quenched β-type Ti-Cr alloys. J Mater Sci 26, 2071–2075 (1991). https://doi.org/10.1007/BF00549169

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  • DOI: https://doi.org/10.1007/BF00549169

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