Li Jianyu, Lü Shulin, Wu Shusen, Gao Qi
State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China.
State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Ultrason Sonochem. 2018 Apr;42:814-822. doi: 10.1016/j.ultsonch.2017.12.038. Epub 2017 Dec 19.
Ultrasonic vibration (UV) treatment has been successfully applied to improve the particles distribution of nano-sized SiC particles (SiC) 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 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 1 wt% nano-sized SiC/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.
超声振动（UV）处理已成功应用于改善通过干式高能球磨和挤压铸造相结合的工艺制备的纳米级碳化硅颗粒（SiC）增强Al-5Cu合金基复合材料的颗粒分布。当进行UV处理时，纳米级SiC的分布得到了极大改善。UV处理1分钟后，由于空化和声流的作用，大颗粒聚集体被破碎成小聚集体。UV处理5分钟后，所有颗粒聚集体都被分散，颗粒在复合材料中均匀分布。与Al-5Cu基体合金相比，经UV处理5分钟的1 wt%纳米级SiC/Al-5Cu复合材料的抗拉强度、屈服强度和伸长率分别为270 MPa、173 MPa和13.3%，分别提高了7.6%、6.8%和29%。UV处理后力学性能的提高归因于纳米颗粒的均匀分布、铝基体合金的晶粒细化以及复合材料中孔隙率的降低。
