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Xuchen Jin, Peihao Ye, Hongrui Ji, Zhuanxia Suo, Boxin Wei, Xuewen Li, and Wenbin Fang, Oxidation resistance of powder metallurgyTi–45Al–10Nb alloy at high temperature, Int. J. Miner. Metall. Mater.,(2022). https://doi.org/10.1007/s12613-021-2320-4
Cite this article as:
Xuchen Jin, Peihao Ye, Hongrui Ji, Zhuanxia Suo, Boxin Wei, Xuewen Li, and Wenbin Fang, Oxidation resistance of powder metallurgyTi–45Al–10Nb alloy at high temperature, Int. J. Miner. Metall. Mater.,(2022). https://doi.org/10.1007/s12613-021-2320-4
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研究论文

粉末冶金Ti–45Al–10Nb合金的高温抗氧化性能

文章亮点

  • (1) 系统地研究了高温氧化过程中粉末冶金Ti–45Al–10Nb合金表面氧化组织的演变规律。
  • (2) 系统地研究了粉末冶金Ti–45Al–10Nb合金的高温抗氧化机理。
  • (3) 总结并提出了Nb能够提高TiAl基合金的高温抗氧化性的原因。
  • 通过粉末冶金法制备了化学成分为Ti–45Al–10Nb的高Nb含量的TiAl合金,并研究了其在850、900和950°C下的抗氧化性能。根据氧化皮形貌和微观结构演变分析,讨论了高温下的抗氧化机理。850°C和900°C的氧化皮结构相似,TiO2+Al2O3混合物覆盖在弥散分布TiO2+Nb2O5的基体层。在950℃时,氧化皮从外部到母体金属分为四层:疏松的TiO2+Al2O3层、致密的Al2O3层、致密的TiO2+Nb2O5层和弥散分布TiO2+Nb2O5的基体层。Nb层抑制了Ti原子的向外扩散,阻碍了TiO2的生长,同时促进形成连续的Al2O3保护层,使合金具有长期的高温抗氧化能力。
  • Research Article

    Oxidation resistance of powder metallurgyTi–45Al–10Nb alloy at high temperature

    + Author Affiliations
    • 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.
    • The authors declare no conflict of interest.
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