高能超声制备及其力学性能
(南京航空航天大学 材料科学与技术学院，南京 210016)
摘 要: 设计一套高能超声搅拌装置，并在氩气氛保护下，通过对纳米CeO2进行预处理及控制工艺参数，用该装置制备了CeO2质量分数分别为1%~6%的纳米CeO2p/Zn-4.5%Al复合材料。用SEM观察颗粒的分散情况，测试材料的室温拉伸性能。结果表明：所设计的装置结构合理、超声作用效果佳；纳米CeO2可以单粒分散入基体合金中；随着CeO2质量分数的增加，复合材料的抗拉强度和弹性模量明显高于基体合金，伸长率则降低；复合材料的断裂机制为脆性断裂。
关键字: 金属基纳米复合材料；纳米CeO2；高能超声搅拌法；力学性能
composite materials by high-power ultrasonic technology
（College of Materials Science and Technology, Nanjing University of Aeronautics & Astronautics,
Nanjing 210016, China）
Abstract:A suit of high-power ultrasonic stirring device was designed to prepare nano-CeO2p/Zn-4.5%Al composites with mass fraction from 1% to 6% through pretreating the reinforcement nano-CeO2 particulates and controlling proper process parameters. Reinforcement distribution was observed by SEM and tensile properties of the composites were tested at room temperature. The results show that the designed device has reasonable structure and well high-ultrasonic effect, and the nano-CeO2 can be homogenously mono-dispersed in the matrix. Compared with the matrix alloy, the tensile strength and elastic modulus of the composites increase obviously with the increment of mass fraction of particles, while the elongation decreases. The tensile fracture also shows that the damage mechanism of composites is brittle fracture.
Key words: metal matrix nanocomposites; nano-CeO2; high-power ultrasonic stirring technology; mechanical property
