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

TiAl中间化合物因其优异的抗蠕变性和抗氧化性而成为高温应用的重要材料。适用于先进军用飞机发动机的高压压气机和低压涡轮叶片。TiAl中间化合物是镍基高温合金的优良替代品，可以减轻40%的重量，并大大提高飞机的推重比。本文采用X射线衍射、扫描电镜-能谱分析和力学测试装置研究了添加3.0 wt.% W和0.1 wt.% Y的单质超细粉体Ti _{2 AlNb合金的显微组织演变和力学性能。}研究结果表明，在1500°、可控氩气流量200 mL/min的炉中等温烧结3小时，可以获得0.9945的高相对密度和优异的_机械性能。 C。该合金在700℃时的拉伸强度、屈服强度和延伸率分别达到1,030 MPa、913 MPa和15.1%。同时，在合金中添加3wt.%的W元素，形成(TiW)C作为第二强化相，均匀分布在Ti ₂ AlNb基体中。在合金中添加0.1wt.%的Y元素可以作为有效的氧清除剂并抑制Ti _{2 AlNb合金中脆性α 2}相的不良析出。与不含添加物的合金相比，添加3wt.%W和0.1wt.%Y的Ti _{2 AlNb合金在25℃和700℃下的断裂抗力分别提高了13.5%和19.35%。}该合金的屈服强度也有所提高。Ti等温烧结过程中主要金相演变规律为(Ti ₂ AlNb–TiAl–Ti ₃ Al)→(Ti ₂ AlNb–Ti ₃ Al)→(Ti ₂ AlNb–Ti ₃ Al–(TiW)C) –22Al–25Nb–3W–0.1Y 合金，温度为 1,500°C。该研究为超细TiAl基合金粉末的制备及高温航空航天应用提供技术指导