(1. 宁夏东方钽业股份有限公司 钛材分公司，石嘴山 753000；2. 西北工业大学 材料学院，西安 710072)
摘 要: 研究Ti-45Nb钛合金丝材在不同温度真空热处理后的显微组织和拉伸性能。结果表明：热处理温度对Ti-45Nb合金丝材的微观组织有明显的影响，但对丝材的拉伸性能影响不大。随着温度的升高，丝材的晶粒不断长大，拉伸强度整体下降，伸长率和断面收缩率略有增大。800 ℃时样品微观组织均匀细小且强塑性匹配最好；热处理温度相同时，不同规格丝材的微观组织差别不明显。随着丝材直径的减小，其拉伸强度有所提高，伸长率变化不大，但断面收缩率略有降低。经过800 ℃固溶处理后，丝材的组织均匀性得到明显的改善。实验还发现，通过热处理提高Ti-45Nb合金丝材强度的效果不明显，但通过增加合金中的O含量可以较为明显的提高合金强度。
关键字: Ti-45Nb；钛合金；丝材；热处理；拉伸性能；微观组织
（1. Titanium Materials Sub-company, Ningxia Orient Tantalum Industry Co., Ltd., Shizuishan 753000, China;
2. School of Materials Science and Engineering, Northwestern, Polytechnical University, Xi’an710072, China）
Abstract:The microstructures and tensile properties of Ti-45Nb wires produced by vacuum annealing heat treatment at various temperatures and sizes were studied. The results show that the effects of the temperatures of the vacuum annealing heat treatment on the microstructures of the wires are obvious while on the tensile properties are slight. With increasing temperature, the grains of the wires grow bigger, and the tensile strength trends to decrease while the elongation and reduction area both increase slightly. The microstructures after the vacuum annealing heat treatment of the wires are fine and uniform and better adoption of strength and plasticity is reached at 800 ℃. The microstructures do not change obviously under annealing at the same temperature, with decreasing diameter of the wires, the tensile strengths increase, the elongation does not change much, the reduction area decreases slightly. The uniformity of microstructures of the wires improves obviously after solution treatment at 800 ℃. The improvement of the tensile strength of the wires by heat treatment is not obvious, but the tensile strength is greatly increased by increasing the oxygen content of the alloy.
Key words: Ti-45Nb; titanium alloy; wire; heat treatment; tensile properties; microstructures
