热处理温度对（TiB+La2O3）/Ti复合材料的显微组织和力学性能的影响

摘要

Near-αtitanium matrix composites reinforced with TiB and La2O3 were synthesized by common casting and hot-working technology. The effects of β heat treatment temperature on the microstructure and the tensile properties of the in situ synthesized (TiB+La2O3)/Ti were studied. Microstructure was studied by OM and TEM, and tensile tests were carried out at room temperature and 923 K, respectively. Results show that with the increase ofβheat treatment temperature, priorβphase grain size increases andαcolony size decreases. Room temperature tensile strength increases with the increase ofβheat treatment temperature, which can be attributed to the decrease of α colony size with the increase of β heat treatment temperature. However, high-temperature tensile strength decreases with the increase ofβheat treatment temperature and the decrease of the high-temperature tensile strength is due to the increase of the priorβphase grain size.%采用熔铸法制备TiB短纤维和La2O3颗粒混杂增强的近α型钛基复合材料，并采用合适的热加工工艺将其加工成板材。研究β热处理温度对原位自生(TiB+La2O3)/Ti复合材料的微观组织和力学性能的影响规律。采用OM和TEM研究钛基复合材料的微观组织，同时测试钛基复合材料的室温以及高温(923 K)拉伸性能。结果表明：随着β热处理温度的升高，原始β晶粒尺寸增大但是α集束的尺寸变小；室温拉伸强度随着β热处理温度的升高而提高，这主要是因为α集束尺寸随着β热处理温度的升高而降低；而高温拉伸强度则随着β热处理温度的升高而降低，这主要是由于原始β晶粒随着β热处理温度的升高而增大。