Nb颗粒增韧Ti-45Al-5Nb-0.3W合金的高温氧化行为

doi:10.19976/j.cnki.43-1448/TF.2023051

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Abstract Ti-45Al-5Nb-0.3W (mole fraction) alloy (Nb_p/TiAl alloy) toughened by 2%Nb particles was prepared by hot isostatic pressing. After heat treatment at 1 280 ℃ for 24 h, the elements diffused fully, and the Nb-rich region transformed into the lamellar structure and γ grains. The phase composition and oxide film structure of the alloy before and after oxidation were studied by optical microscope, X-ray diffraction, scanning electron microscope, energy spectrometer, and electron probe microanalysis, and the oxidation mechanism of Nb_p/TiAl alloy was revealed. The results show that the oxidation kinetics curves of Nb_p/TiAl alloy during isothermal oxidation at 800, 850, and 900 ℃ are parabolic, and the mass increments per unit area after 100 h oxidation are 3.32, 7.36 and 17.27 g/m², respectively. A protective oxide film is formed on the alloy surface with multi-layer structure of TiO₂/Al₂O₃/(Al₂O₃+ TiO₂+NbO)/(TiN+Ti₂AlN+AlNb₂), which can effectively inhibit the diffusion of O element in the alloy and improve the oxidation resistance of TiAl alloy.

Key words： Nb particle TiAl alloy powder metallurgy heat treatment high temperature oxidation

Received: 06 May 2023 Published: 22 November 2023

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	HUANG Jiani
	LI Huizhong
	LIANG Xiaopeng
	CHE Yixuan

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HUANG Jiani,LI Huizhong,LIANG Xiaopeng, et al. High temperature oxidation behavior of Nb-particle reinforced Ti-45Al-5Nb-0.3W alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(5): 456-464.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023051 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I5/456

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