采用原位合成法制备了TiB_2/ZL205A复合材料,对所合成复合材料的物相、TiB_2颗粒形貌及分布、流动性进行了研究。结果表明:TiB_2/ZL205A复合材料主要由α-Al、Al_2Cu和TiB_2组成,TiB_2颗粒呈多边形或卵圆形,平均颗粒尺寸500nm左右,大部分沿晶界分布,少量分布在晶粒内部。TiB_2/ZL205A复合材料的流动性与浇铸温度及TiB_2质量分数的关系均可用指数阻尼模型进行描述。当浇铸温度由710℃提高到750℃时,7wt%TiB_2/ZL205A复合材料的流动性提高了30.4%;当浇铸温度在750℃以上时,7wt%TiB_2/ZL205A复合材料的流动性随浇铸温度的提高而提高的速率降低。与基体合金相比,在730℃浇铸时,3wt%TiB_2/ZL205A复合材料的流动性降低了21.8%,7wt%TiB_2/ZL205A复合材料的流动性降低了36.4%。 TiB_2 / ZL205A composites were prepared by in-situ synthesis method. The morphology, distribution and fluidity of TiB_2 particles were studied. The results show that the TiB 2 / ZL205A composites consist mainly of α-Al, Al 2 Cu and TiB 2. The TiB 2 particles are polygonal or oval with the average particle size of about 500 nm. Most of the TiB 2 / ZL205A composites distribute along the grain boundaries and a small amount distribute in the grains. The relationship between the fluidity of TiB_2 / ZL205A composites and the casting temperature and the mass fraction of TiB_2 can be described by the exponential damping model. When the casting temperature is increased from 710 ℃ to 750 ℃, the flowability of 7wt% TiB_2 / ZL205A composites increases by 30.4%. When the casting temperature is above 750 ℃, the fluidity of 7wt% TiB_2 / ZL205A composites increases with the casting temperature Increase and increase the rate of decrease. Compared with the base alloy, the flowability of 3wt% TiB_2 / ZL205A composite decreased by 21.8% and the flowability of 7wt% TiB_2 / ZL205A composite decreased by 36.4% when cast at 730 ℃.