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采用熔铸法制备TiB短纤维和La_2O_3颗粒混杂增强的近a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+La_2O_3)/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。
A nearly Ti-based Ti-matrix composite reinforced by TiB short fibers and La_2O_3 particles was prepared by melt casting and processed into plate by suitable hot working process. The influence of β heat treatment temperature on the microstructure and mechanical properties of in-situ (TiB + La_2O_3) / Ti composites was studied. The microstructure of Ti-based composites was studied by OM and TEM, and the tensile properties of Ti-based composites were tested both at room temperature and high temperature (923 K). The results show that with the increase of β heat treatment, the original β grain size increases but the size of α cluster decreases. The tensile strength at room temperature increases with the increase of β heat treatment temperature, which is mainly due to Β heat treatment temperature increases and decreases; and high temperature tensile strength with β heat treatment temperature decreases, mainly due to the original β grains with β heat treatment temperature increases.