(1. 西北有色金属研究院，西安 710016；
2. 西安交通大学 材料科学与工程学院, 西安 710049)
摘 要: 采用500~1 000 ℃热循环20次，研究Ti-6Al-4V(TC4)合金性能及微观组织的变化。结果表明：随热循环温度的升高，TC4合金强度先降低后升高；低于800 ℃时，TC4合金塑性随热循环温度升高变化不大，高于800 ℃，随热循环温度升高，TC4合金塑性快速降低；随温度升高，TC4合金的晶粒明显长大，温度高于800 ℃时，TC4合金中开始形成片层状组织，至1 000 ℃时，合金组织几乎呈全片层状。
关键字: TC4钛合金；热循环；力学性能；微观组织
and mechanical properties of Ti-6Al-4V alloy
（1. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China;
2. School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China）
Abstract:The changes of microstructures and mechanical properties of Ti-6Al-4V alloy after thermal cycling 20 times from 500 ℃ to 1 000 ℃ were researched. The results show that the strength of Ti-6Al-4V alloy firstly reduces and then increases with the increase of cycling temperature. If the cycling temperature is lower than 800 ℃, its plasticity changes less with the temperature. While the temperature is higher than 800 ℃, its plasticity decreases fast. The grain size grows fast with increasing temperature. While the temperature is over 800 ℃, the lamellar microstructure forms, when the temperature reaches 1 000 ℃, the microstructure is almost lamellar one.
Key words: Ti-6Al-4V alloy; thermal cycling; mechanical properties; microstructures
