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采用半固态金属-增强相混合工艺制备SiC颗粒体积分数为10%的SiC_P/7085铝基复合材料,研究微米SiC颗粒在机械搅拌、超声搅拌和复合搅拌等工况下在7085铝基体中的分布规律以及不同制备工艺对SiC_P/7085复合材料拉伸性能的影响规律。结果表明:机械搅拌能够改善颗粒分布的均匀性,但同时会增加气孔缺陷;超声搅拌能有效减少复合材料中的气孔数量;采用复合搅拌工艺(30min机械搅拌+30 min超声搅拌)制备的SiC_P/7085复合材料颗粒分布均匀、气孔显著减少,抗拉强度较基体合金有较大提高,其中SiC颗粒尺寸为80、30μm的复合材料的最大抗拉强度较基体分别提高了57%和67%。
The SiC_P / 7085 aluminum matrix composites with 10% SiC particle size were prepared by semi-solid metal-reinforced phase mixing process. The distribution of SiC particles in 7085 aluminum matrix was studied under mechanical stirring, ultrasonic stirring and compound stirring Law and different preparation process on the tensile properties of SiC_P / 7085 composite. The results show that mechanical stirring can improve the uniformity of particle distribution, but at the same time increase the porosity defects. Ultrasonic stirring can effectively reduce the number of pores in the composites. The mechanical properties of SiC_P / Al composites prepared by composite stirring (30min mechanical stirring + 30min ultrasonic stirring) 7085 composites have uniform distribution of pores, significantly reduced porosity and higher tensile strength than the matrix alloy. The maximum tensile strength of the composites with SiC particle sizes of 80 and 30μm is 57% and 67% higher than that of the matrix respectively.