(北京有色金属研究院 有色金属材料制备加工国家重点实验室，北京 100088)
摘 要: 采用金相法测定了Ti-6554钛合金的TTT曲线。结果表明：测得等温转变的“鼻温”在540 ℃左右，在此温度时效时，α相析出速度最快，仅需5 min。另外，该合金的时效响应快，在480~600 ℃时效时，α相从亚稳β相中析出的开始时间均少于30 min。
关键字: 钛合金；金相法；TTT曲线
（State Key Laboratory of Fabrication and Processing for Nonferrous Metals,
General Research Institute for Non-ferrous Metal, Beijing 100088, China）
Abstract:Metallographic method was used for the determination of TTT curve of Ti-6554 titanium alloy. The results show that the ‘nose’ temperature of isothermal transformation is about 540 ℃. When the alloy is aged at 540 ℃, α phase precipitates fastest, and only 5 min is needed. Moreover, this alloy has fast aging response. When the alloy is aged at 480−600 ℃, the beginning time of α phase precipitated from metastable β phase is less than 30 min.
Key words: titanium alloy; metallographic method; isothermal transformation
