Wen Yu, Jian-xin Zhou, Ya-jun Yin, Zhi-xin Tu, Xin Feng, Hai Nan, Jun-pin Lin, and Xian-fei Ding, Effects of heat treatments on microstructures of TiAl alloys, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-021-2252-z
Cite this article as:
Wen Yu, Jian-xin Zhou, Ya-jun Yin, Zhi-xin Tu, Xin Feng, Hai Nan, Jun-pin Lin, and Xian-fei Ding, Effects of heat treatments on microstructures of TiAl alloys, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-021-2252-z
Research Article

Effects of heat treatments on microstructures of TiAl alloys

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  • Received: 24 November 2020Revised: 6 January 2021Accepted: 15 January 2021Available online: 16 January 2021
  • This study aims to investigate the effects of heat treatments on microstructures of γ-TiAl alloys. Two Ti-47Al-2Cr-2Nb alloy ingots were manufactured by casting method and then heat treated in two types of heat treatments. Their microstructures were studied by both optical and scanning electron microscopies. The chemical compositions of two ingots were determined. The ingot with lower Al content only obtains lamellar structures while the one higher in Al content obtains nearly lamellar and duplex structures after heat treatment within 1270°C to 1185°C. A small amount of B2 phase is found to be precipitated in both as-cast and heat-treated microstructures. They are distributed at grain boundaries when holding at a higher temperature, such as 1260°C. However, B2 phase is precipitated at grain boundaries and in colony interiors simultaneously after heat treatments happened at 1185°C. Furthermore, the effects of heat treatments on grain refinement and other microstructural parameters are discussed.
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