(1. 北京航空材料研究院，北京 100095；
2. 西北工业大学 凝固技术国家重点实验室，西安 710072；
3. 西部超导材料科技有限公司，西安 710018)
摘 要: 研究不同规格的Ti-45Nb合金丝材的显微组织和力学性能。结果表明：随着Ti-45Nb合金丝材尺寸的增大，其抗拉强度不断降低，但屈服强度和剪切强度不断增加，而显微组织以及拉伸塑性的变化幅度不是很明显；经热暴露后的Ti-45Nb合金丝材，拉伸强度明显增加，但拉伸塑性的下降也比较明显；不同规格的Ti-45Nb合金丝材经过冷顶锻测试后的样品表面均没有宏观裂纹萌生，表明材料具有良好的冷成形性能。
关键字: Ti-45Nb合金；紧固件；显微组织；力学性能
（1. Beijing Institute of Aeronautical Materials，Beijing 100095, China;
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;
3. Western Superconducting Technologies Co., Ltd., Xi’an 710018, China）
Abstract:The microstructures and mechanical properties of Ti-45Nb alloy wires with different dimensions were investigated. The results show that, with increasing the dimensions of Ti-45Nb alloy wires, the tensile strength of Ti-45Nb alloy decreases gradually, but the yield strength and tear strength increase gradually, the microstructures and tensile plasticity do not change obviously. After thermal exposure, the tensile strength increases obviously, but the tensile plasticity decreases. There is no macroscopic cracking initiation when Ti-45Nb alloy wires with different dimensions are cold upset, which indicates that the Ti-45Nb alloy wires have good properties of cold deformation and forming.
Key words: Ti-45Nb alloy; fastener; microstructure; mechanical property
