High temperature oxidation behavior of Nb-particle reinforced Ti-45Al-5Nb-0.3W alloy
HUANG Jiani1, LI Huizhong1,2,3, LIANG Xiaopeng1,2,3, CHE Yixuan1
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 3. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,Central South University, Changsha 410083, China
Abstract：Ti-45Al-5Nb-0.3W (mole fraction) alloy (Nbp/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 Nbp/TiAl alloy was revealed. The results show that the oxidation kinetics curves of Nbp/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.
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2023, Vol. 28 
