(1. 北京有色金属研究总院 有色金属材料制备加工国家重点实验室，北京 100088；
2. 宝钛集团有限公司，宝鸡 721014)
摘 要: 研究了Ti-6554(Ti-6Cr-5Mo-5V-4Al)合金在相变点以上的晶粒长大动力学。结果表明：在800 ℃固溶处理时，随着固溶时间的延长，晶粒的尺寸增加，固溶时间超过60 min后，晶粒长大速度加快。800 ℃时，晶粒平均直径随时间的长大方程为 6.16t0.5。固溶时间为30 min时，随着固溶温度的升高，合金的晶粒尺寸增大，920 ℃固溶处理后，晶粒明显粗化。在本研究的温度和时间范围内，固溶温度对晶粒度的影响更为显著。
关键字: 钛合金；固溶；长大动力学
（1. State Key Laboratory of Fabrication and Processing for Nonferrous Metals,
General Research Institute for Non-ferrous Metals, Beijing 100088, China;
2. Baoti Group. Ltd., Baoji 721014, China）
Abstract:The grain growth kinetics of Ti-6Cr-5Mo-5V-4Al alloy solution treated above β transformation temperature was studied. The result indicates that, when the alloy is solution treated at 800 ℃, grain size increases with solution time prolonging. Increasing velocity of grain size will be accelerated when solution time is more than 60 min. When the alloy is solution treated at 800 ℃, the function of average grain diameter increasing with solution time is 6.16t0.5. When the alloy is solution treated for 30 min, grain size increases with solution temperature rising, and grain coarsening is obvious at 920 ℃. For temperature and time range in this research, grain size is more sensitive to solution temperature.
Key words: titanium alloy; solution treatment; growth kinetics
