超声振动对纳米SiC_p/Al-5Cu复合材料组织与性能的影响  

Effect of Ultrasonic Vibration on Microstructure and Mechanical Properties of Nano-SiC_p/Al-5Cu Composites

作　　者：李建宇 吕书林[1] 吴树森[1] 鲁康 高琦[1] LI Jianyu;LYU Shulin;WU Shusen;LU Kang;GAO Qi(State Key Lab of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《航空材料学报》2018年第4期93-100,共8页Journal of Aeronautical Materials

基　　金：国家自然科学基金(51574129)

摘　　要：结合超声处理、干式高能球磨与挤压铸造工艺制备纳米SiC_p/Al-5Cu(质量分数/%,下同)铝基复合材料。研究发现超声振动处理能有效改善纳米颗粒分布。超声振动1 min后,由于声空化与声流作用,大块的颗粒团聚被消除。超声处理5 min后,所有的团聚被分散,颗粒在基体合金中均匀分布。1%纳米SiC_p/Al-5Cu复合材料的抗拉强度、屈服强度、伸长率分别为270 MPa,173 MPa和13.3%,相比于Al-5Cu基体合金,相应地提高了7.6%,6.8%和29%,并且比未超声的复合材料分别提高了27.4%,9.5%和303%。经超声振动处理后的复合材料,其力学性能的提高主要归因于增强相的均匀分布与铝合金基体的晶粒细化。The ultrasonic vibration(UV)treatment has been successfully applied to improve the particles distribution of nano-SiCp reinforced Al-5Cu composites fabricated by combined processes of dry high energy ball milling and squeeze casting.Large particles aggregates are eliminated by effects of the cavitation and the acoustic streaming of UV for 1 min.All the particles aggregates are eliminated and the particles are uniformly distributed in the melt after treated by UV for 5 min.The ultimate tensile strength,yield strength and elongation of the 1%(mass fraction)nano-sized SiCp/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%compared with Al-5Cu matrix alloy,respectively,and are increased by 27.4%,9.5%and 303%compared with the untreated composites,respectively.The improvements of mechanical properties after UV are attributed to the uniform distribution of reinforcement and grain refinement of aluminum alloy matrix.

关 键 词：纳米SIC颗粒 铝基复合材料 颗粒分布 超声振动 

分 类 号：TB311[一般工业技术—材料科学与工程]