(1. 中航工业北京航空材料研究院，北京 100095；
2. 哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001)
摘 要: 通过改变热处理温度，研究热处理工艺对Ti44Al6Nb0.6B合金宏观组织、显微组织及力学性能的影响。结果表明：随着热处理温度的升高，Ti44Al6Nb0.6B合金的宏观组织晶粒尺寸不断增大，1 330 ℃时合金的组织为大量的粗大等轴晶；1 200 ℃和1 270 ℃热处理后，Ti44Al6Nb0.6B合金的显微组织均为全片层组织，1 330℃热处理后，合金具有明显的近全片层组织。显微硬度测试表明这3种热处理均降低了显微硬度值，但随着温度的升高，显微硬度有所提高，这可能是由于固溶强化引起的。
关键字: 钛铝合金；热处理；细化；显微硬度；晶粒
（1. AVIC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:The influence of heat treatment on the macro/micro-structure and mechanical properties of Ti44Al6Nb0.6B alloy at different temperatures was studied. The results show that the grain size increases with the increase of the temperature. There are lots of coarse equiaxed grains in the sample when the heat treatment temperature is 1 330 ℃. The microstructure of Ti44Al6Nb0.6B alloy is changed into full lamella structure when it is heat treated at 1 200 ℃ and 1 270 ℃. However, the microstructure changes to near full lamella structure when the temperature is 1 330 ℃. Micro-hardness testing shows that all of the heat treatments decrease the hardness, but the hardness increases with the increase of temperature, which maybe resulted from solution strengthening.
Key words: TiAl alloy; heat treatment; refining; micro-hardness; grain
