Ultrasonic vibration(UV) treatment has been successfully applied to improve the particles distribution of nano-sized SiC particles(SiC_p) reinforced Al-5Cu alloy matrix composites which were prepared by combined processes of dry high energy ball milling and squeeze casting. When UV treatment is applied, the distribution of nano-sized SiC_p has been greatly improved. After UV for 1 min, large particles aggregates are broken up into small aggregates due to effects of cavitation and the acoustic streaming. After UV for 5 min, all the particles aggregates are dispersed and the particles are uniformly distributed in the composites. Compared with the Al-5Cu matrix alloy, the ultimate tensile strength, yield strength and elongation of the 1wt% nano-sized SiC_p/Al-5Cu composites treated by UV for 5 min are 270 MPa, 173 MPa and 13.3%, which are increased by 7.6%, 6.8% and 29%, respectively. The improvements of mechanical properties after UV are attributed to the uniform distribution of nano particles, grain refinement of aluminum matrix alloy and reduction of porosity in the composites.

超声波振动（UV）处理已成功地应用于改善纳米尺寸的碳化硅颗粒（SiC的颗粒分布_p）增强其通过干高能球磨和挤压铸造的组合方法制备的Al-5Cu合金基复合材料。当施加UV处理，纳米尺寸的SiC的分布_p有了很大的提高。紫外线照射1分钟后，由于空化和声流的作用，大颗粒的聚集体被分解成小聚集体。在紫外线下5分钟后，所有颗粒聚集体被分散并且颗粒均匀地分布在复合物中。与Al-5Cu基合金相比，1wt％纳米SiC _p的极限拉伸强度，屈服强度和伸长率紫外处理5min的/ Al-5Cu复合材料为270 MPa，173 MPa和13.3％，分别增加了7.6％，6.8％和29％。紫外线后机械性能的提高归因于纳米颗粒的均匀分布，铝基合金的晶粒细化以及复合材料中孔隙率的降低。