In-situ study on γ phase transformation behaviour of γ-TiAl alloys at different cooling rates

Zhiping Li, Liangshun Luo*, Yanqing Su*, Binbin Wang, Liang Wang, Tong Liu, Mengjia Yao, Chen Liu, Jingjie Guo, Hengzhi Fu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

γ-TiAl-based alloys are promising lightweight high-temperature structural materials, and the transformation from the α parent phase to γ lamellae during the cooling process has a great influence on the microstructures and mechanical properties of TiAl alloys. In this paper, an in-situ observation technique, high-temperature laser scanning confocal microscopy (HTLSCM), was utilized to investigate the continuous cooling transition (CCT) from the α phase in three compositions. The nucleation and growth behaviors of γ lamellae were studied at several moderate cooling rates. In addition, the processes of helium gas quenching for three alloys were investigated, and the massive transformation was observed in Ti–49Al. CCT diagraphs were concluded for three alloys. The Vickers hardness of TiAl alloys subjected to different cooling rates was tested, and it was found that the hardness of alloys was enhanced with increasing cooling rate due to the refinement of lamellar spacing.

Original languageEnglish
Pages (from-to)345-357
Number of pages13
JournalProgress in Natural Science: Materials International
Volume32
Issue number3
DOIs
Publication statusPublished - Jun 2022
Externally publishedYes

Keywords

  • High-temperature laser scanning confocal microscopy
  • Nucleation and growth
  • Phase transformation
  • TiAl based Alloys

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Li, Z., Luo, L., Su, Y., Wang, B., Wang, L., Liu, T., Yao, M., Liu, C., Guo, J., & Fu, H. (2022). In-situ study on γ phase transformation behaviour of γ-TiAl alloys at different cooling rates. Progress in Natural Science: Materials International, 32(3), 345-357. https://doi.org/10.1016/j.pnsc.2022.03.004