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Microstructural Evolution and Mechanical Properties of the Ti2AlNb Alloy with 3 wt.% W and 0.1 wt.% Y Obtained Using Powder Metallurgy Technique

  • SINTERED METALS AND ALLOYS
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Powder Metallurgy and Metal Ceramics Aims and scope

TiAl intermediate compound is an important material for high-temperature applications due to its superior creep resistance and oxidation resistance. It is suitable for high-pressure compressors and low-pressure turbine blades of advanced military aircraft engines. TiAl intermediate compound is an excellent substitute for nickel-based superalloys, as it can decrease weight by 40% and greatly enhance aircraft thrust-to-weight ratio. In this paper, the microstructure evolution and the mechanical properties of Ti2AlNb alloy with a 3.0 wt.% W and 0.1 wt.% Y addition obtained by blending elemental ultrafine powders was investigated by XRD, SEM-EDS, and mechanical testing device. The findings show that high relative density of 0.9945, and the excellent mechanical properties of Ti2AlNb–3W–0.1Y alloy can be obtained through isothermal sintering for 3 hour in a furnace with controllable argon atmosphere flow of 200 mL/min at 1,500°C. The alloy’s tensile strength, yield strength, and elongation reach 1,030 MPa, 913 MPa, and 15.1% at 700°C, respectively. Meanwhile, the 3 wt.% of element W is added to the alloy to form (TiW)C as the second strengthening phase, which is uniformly distributed in the matrix of Ti2AlNb. The addition of Y element at 0.1 wt.% into the alloy can act as an effective scavenger of oxygen and inhibit the unsatisfactory precipitation of the brittle α2-phase in the Ti2AlNb alloy. Compared to the alloy without additions, the Ti2AlNb alloy with 3 wt.% W and 0.1 wt.% Y demonstrated 13.5% and 19.35% improvements in the fracture resistance at 25°C and 700°C, respectively. The alloy’s yield strength was increased as well. The evolution regularity of the main metallography is (Ti2AlNb–TiAl–Ti3Al) → (Ti2AlNb–Ti3Al) → (Ti2AlNb–Ti3Al–(TiW) C) during the isothermal sintering of Ti–22Al–25Nb–3W–0.1Y alloy at 1,500°C. This study provides technical guidance for the preparation of ultrafine TiAl-based alloy powder and high-temperature aerospace applications

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 52174274).

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Authors and Affiliations

  1. Department of Physical Chemistry of Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, PR China

    Youyu Li

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Correspondence to Youyu Li.

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Published in Poroshkova Metallurgiya, Vol. 62, Nos. 5–6 (551), pp. 49–59, 2023

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Li, Y. Microstructural Evolution and Mechanical Properties of the Ti2AlNb Alloy with 3 wt.% W and 0.1 wt.% Y Obtained Using Powder Metallurgy Technique. Powder Metall Met Ceram 62, 302–311 (2023). https://doi.org/10.1007/s11106-023-00394-1

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