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研究了Ti_2AlNb合金铸态及热处理态的组织与拉伸性能。结果表明：Ti_2AlNb合金的铸态组织由粗大板条状O相、B2基体及晶界连续片层α2相组成；经1020℃×2 h/AC(空冷)+960℃×2 h/OC(油冷)+800℃×24 h/AC热处理后，晶界α2相显著球化，组织演变为球化α2颗粒、粗/细片层α2/O相及B2基体；α2相的球化过程为扩散主导的相变，通过阻碍裂纹萌生及偏折扩展路径显著提升合金的塑性；与铸态及B2单相区退火(1070℃)+固溶时效态合金相比，1020℃退火及固溶时效后合金在保持高强度的同时(抗拉强度和屈服强度分别为1080.5和1019.7 MPa),伸长率(9.26%)分别大幅提升了349.5%和148.3%。
Abstract：Microstructure and tensile properties of Ti_2AlNb alloy in as cast and heat-treated states were studied. The results show that the as cast microstructure of the Ti_2AlNb alloy consists of coarse lamellar O phase, B2 matrix and grain boundary continuous lamellar α2 phase. After heat treatment by 1020 ℃× 2 h/AC(air cooling)+960 ℃× 2 h/OC(oil cooling)+800 ℃× 24 h/AC, the grain boundary α2 phase undergoes significant spheroidization, and the microstructure evolves into spheroidized α2 phase particles, coarse/fine lamellar α2/O phase, and B2 matrix. The spheroidization process of α2 phase is a diffusion dominated phase transformation, which significantly improves the plasticity of the alloy by hindering crack initiation and deflecting crack propagation paths. Compared with the as cast and B2 single-phase annealed(1070 ℃)+solution aged alloys, the alloy annealed at 1020 ℃ + solution aged has high strength(tensile strength and yield strength of 1080.5 MPa and 1019.7 MPa, respectively), and the elongation(9.26%) increases significantly by 349.5% and 148.3%, respectively.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2025-0296
中图分类号:TG166.5
引用信息:
[1]贾可伦,程超,张博华,等.Ti_2AlNb合金铸件晶界球化热处理与塑性优化[J].材料热处理学报,2026,47(07):55-63.DOI:10.13289/j.issn.1009-6264.2025-0296.
2026-07-23
2026-07-23