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Oxidation resistance of powder metallurgy Ti—45Al—10Nb alloy at high temperature

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Abstract

TiAl alloy with high Nb content, nominally Ti—45Al—10Nb, was prepared by powder metallurgy, and the oxidation resistance at 850, 900, and 950°C was investigated. The high-temperature oxidation-resistance mechanism and oxidation dynamics were discussed following the oxide skin morphology and microstructural evolution analysis. The oxide skin structures were similar for 850 and 900°C, with TiO2+Al2O3 mixture covering TiO2 with dispersed Nb2O5. At 950°C, the oxide skin was divided into four sublayers, from the outside to the parent metal: loose TiO2+Al2O3, dense Al2O3, dense TiO2+Nb2O5, and TiO2 matrix with dispersed Nb2O5. The Nb layer suppressed the outward diffusion of Ti atoms, hindering the growth of TiO2, and simultaneously promote the formation of a continuous Al2O3 protective layer, providing the alloy with long-term high-temperature oxidation resistance.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51704088), the Natural Science Foundation of Heilongjiang Province of China (No. YQ2020E030), and the Young Innovative Talents Training Plan of Heilongjiang Province, China (No. UNPY-SCT-2017084).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China

    Xuchen Jin, Peihao Ye, Hongrui Ji, Zhuanxia Suo, Boxin Wei, Xuewen Li & Wenbin Fang

  2. The State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China

    Xuewen Li

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  1. Xuchen Jin
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  2. Peihao Ye
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Correspondence to Xuewen Li.

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Jin, X., Ye, P., Ji, H. et al. Oxidation resistance of powder metallurgy Ti—45Al—10Nb alloy at high temperature. Int J Miner Metall Mater 29, 2232–2240 (2022). https://doi.org/10.1007/s12613-021-2320-4

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  • DOI: https://doi.org/10.1007/s12613-021-2320-4

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