Journal of Materials Engineering

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Effect of Co on microstructure and high temperature oxidation resistance of Ti45Al-8Nb-0.3Y alloy

XIE Xiaoqing, LI Xuan, LYU Wei, LAI Sheng, LIU Yi, LI Jianjun, XIE Wenling

Journal of Materials Engineering, 2022, 50(1): 101-108. DOI: 10.11868/j.issn.1001-4381.2021.000116

Fig.4 Mass gains and macrographic morphologies of Ti45Al-8Nb-0.3Y-mCo alloys after isothermal oxidation at 1000 ℃ (a)mass gains after oxidation for different time; (b)mass gains and macrographic morphologies of samples after oxidation for 100 h

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Fig.1 SEM morphologies of the microstructures of Ti45Al-8Nb-0.3Y-mCo alloys (a)m=0;(b)m=0.5;(c)m=1;(d)m=2
Table 1 EDS component analysis results of the typical phases marked in fig. 1
Fig.2 XRD patterns of Ti45Al-8Nb-0.3Y-mCo alloys
Fig.3 Typical lamellar microstructures of Ti45Al-8Nb-0.3Y-mCo alloys (a)m=0;(b)m=0.5;(c)m=1;(d)m=2
Fig.5 SEM morphologies of surface (1) and cross-section and EDS analysis maps (2) of the oxide films formed on Ti45Al-8Nb-0.3Y-mCo alloys after oxidation at 1000 ℃ for 100 h (a)m=0;(b)m=0.5;(c)m=1;(d)m=2
Fig.6 XRD patterns of oxide films on the surfaces of Ti45Al-8Nb-0.3Y-mCo alloys after oxidation at 1000 ℃ for 100 h
Table 2 EDS component analysis results of the typical phases marked in fig. 5
Fig.7 Gibbs free energy changes for Ti, Al, Nb, Co and Y to respectively react with 1 mol O₂ to form TiO₂, TiO, Al₂O₃, Nb₂O₅, CoO and Y₂O₃ at different temperatures

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