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The Ti2AlNb alloys developed on Ti-Al series of intermetallic compounds, which have great potentials in aerospace applications because of their attractive performance at high temperature including high specific strength and stiffness, excellent oxidation and creep resistance. The Ti-22Al-25Nb (at.%) alloy was studied in this article, which belong to Ti2AlNb intermetallic compound. Specimens of Ti-22Al-25Nb (at.%) alloy were subjected to cyclic oxidation tests within the temperature range of 600 ℃ ~ 700 ℃ to investigate both the alloy’s cyclic oxidation resistance and the ensuing impact on its mechanical properties. Following high-temperature cyclic oxidation, the alloy exhibited minimal variations in tensile strength while experiencing a significant decline in elongation. The microstructure kept stable during cyclic oxidation tests. The formation of a brittle surface layer during the cyclic oxidation process was identified as the primary factor contributing to the reduction in elongation. These results suggest that the Ti-22Al-25Nb alloy possesses robust cyclic oxidation resistance, particularly in terms of load-bearing capacity.

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Effects of Cyclic Oxidation on the Microstructure and Mechanical Properties of Ti2AlNb Alloys

  • 会议论文

  • 发表日期：

    2025年

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  • Hongze Zhao,
  • Xiong Ma,
  • Xiaoqiang Shi,
  • Yan Hao,
  • Kuibao Zhang,
  • Xiaobo Liang,
  • Jianwei Zhang

摘要

The Ti2AlNb alloys developed on Ti-Al series of intermetallic compounds, which have great potentials in aerospace applications because of their attractive performance at high temperature including high specific strength and stiffness, excellent oxidation and creep resistance. The Ti-22Al-25Nb (at.%) alloy was studied in this article, which belong to Ti2AlNb intermetallic compound. Specimens of Ti-22Al-25Nb (at.%) alloy were subjected to cyclic oxidation tests within the temperature range of 600 ℃ ~ 700 ℃ to investigate both the alloy’s cyclic oxidation resistance and the ensuing impact on its mechanical properties. Following high-temperature cyclic oxidation, the alloy exhibited minimal variations in tensile strength while experiencing a significant decline in elongation. The microstructure kept stable during cyclic oxidation tests. The formation of a brittle surface layer during the cyclic oxidation process was identified as the primary factor contributing to the reduction in elongation. These results suggest that the Ti-22Al-25Nb alloy possesses robust cyclic oxidation resistance, particularly in terms of load-bearing capacity.