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Phase selection and solidification path transition of Ti–48Al–xNb alloys with different cooling rates

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Abstract

Ti–48Al–xNb alloys were solidified by containerless electromagnetic levitation with quenching system of the conical copper mold. The influence of cooling rates on phase selection of Ti–48Al–xNb alloys was investigated. In near-equilibrium solidification condition, the dendrite β phase is observed as the leading phase. No other metastable phase (e.g., α phase) is observed. In contrast, in rapid solidification condition, the metastable α phase is observed in as-quenched Ti–48Al–2Nb alloy. Furthermore, the metastable α phase is replaced by the primary β phase with Nb addition increasing. For Ti–48Al–(x = 4, 6, 8)Nb alloys, increasing cooling rate results in a solidification path transition. The peritectic reaction (L + β → α) is therefore significantly suppressed. The relationships between primary dendrite arm spacing (λ 1) and cooling rate (τ) can be described.

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Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (No. 51401168) and the 111 Project (the Discipline Innovative Engineering Plan) of Northwestern Polytechnical University (No. B08040).

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Authors and Affiliations

  1. The State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Tan He, Rui Hu, Jie-Ren Yang & Heng-Zhi Fu

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  1. Tan He
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  2. Rui Hu
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  3. Jie-Ren Yang
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  4. Heng-Zhi Fu
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Correspondence to Rui Hu.

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He, T., Hu, R., Yang, JR. et al. Phase selection and solidification path transition of Ti–48Al–xNb alloys with different cooling rates. Rare Met. 42, 288–295 (2023). https://doi.org/10.1007/s12598-017-0909-6

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  • DOI: https://doi.org/10.1007/s12598-017-0909-6

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