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Phase equilibria and transformation in the Ti–Al–Ta system

  • Metals & corrosion
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Abstract

TiAl- or Ti3Al-based alloys have gained industrial applications in recent years. The incorporation of β-stabilizing element Ta has demonstrated to better adjust their microstructures and properties by introduce β and O. However undesirable phases B2 and ωo are also triggered. Phase equilibrium information and the formation mechanisms of phases B2, ωo and O including solubility limit and stability range can provide a necessary basis for selecting alloy composition and heat treatment process of excellent Ti–Al–Ta alloys. In this work, several isothermal sections from 973 to 1373 K in Ti–Al–Ta system are investigated using highly efficient method integrated equilibrated alloys and diffusion triples. Based on the present results, solubility of Al changes from 35.7 at.% at 1456 K to 6.5 at.% at 973 K in β(Ti)/B2. The β(Ti)/B2 phase region shrinks with the decrease of temperature, while Al-rich B2 phase is separated from β(Ti)/B2 to form an island-like region at the temperature between 1373 and 1273 K. At about 1182.3 K, B2 transforms into ωo-Ti3Al2Ta, leading to the obvious change of microhardness. Meanwhile, O-Ti2AlTa phase occurs via reaction β(Ti)/B2 + Ti3Al + Ta2Al → O at 1185.5 ± 12.5 K. As temperature drops, the compositional ranges of ωo and O expand, extending along the direction parallel to the ligature of Ta and Ti3Al. The phase region of ωo covers 11.3–20.6 at.% Ta and 29.7–33.6 at.% Al at 973 K. According to the evolution of phase relations, both invariant reactions Ti3Al + Ta2Al →  ωo  + O and Ti3Al + Ta2Al →  ωo  + TiAl can be defined.

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Acknowledgements

Financial supports by grants from the National MCF Energy R&D Program of China (No. 2018YFE0306100) and the National Key Research and Development Plan (No. 2016YFB0701301), are gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Xing-Ming Huang, Ge-Mei Cai & Hua-Shan Liu

  2. Key Lab of Non-Ferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, 410083, People’s Republic of China

    Ge-Mei Cai & Hua-Shan Liu

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Huang, XM., Cai, GM. & Liu, HS. Phase equilibria and transformation in the Ti–Al–Ta system. J Mater Sci 57, 2163–2179 (2022). https://doi.org/10.1007/s10853-021-06655-x

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