纳米SiC颗粒增强ADC12铝基复合材料的制备及性能  

Preparation and Properties of Nano-sized SiC Particles Reinforced ADC12 Aluminum Matrix Composites

作　　者：高飞鹏[1] 刘世英[1] 张琼元[1] 韦彦锦[1] 李文珍[1] 

机构地区：[1]清华大学机械工程系,先进成形制造教育部重点实验室,北京100084

出　　处：《特种铸造及有色合金》2009年第12期1140-1143,共4页Special Casting & Nonferrous Alloys

摘　　要：采用机械搅拌和超声分散相结合的方法制备出了纳米SiC颗粒增强ADC12铝合金基复合材料,并对制备出的复合材料进行微观结构分析和力学性能测试。结果表明,与基体合金相比,当纳米SiC颗粒的含量为2.0%时,所制得的复合材料的抗拉强度、弹性模量、断面收缩率及硬度分别提高23%、43%、160%和7.4%。用扫描电镜对试样拉伸断口的形貌和SiC颗粒的分散情况进行观察,发现纳米SiC颗粒在基体内呈均匀的弥散分布,没有发现大的团聚。同时,纳米SiC颗粒的均匀分布起到了阻碍或者阻止裂纹产生和扩展的作用。Nano-sized SiC particles reinforced aluminum matrix composites were fabricated by mechanical stirring and high-intensity ultrasonic method,and mechanical properties and microstructure of the prepared composites were investigated.The results reveal that compared with those of ADC matrix alloy,the tensile strength,elastic modulus,reduction of area and hardness of the composites are improved by 23%,43%,160% and by 7.4%,respectively,with 2.0% SiC reinforcement in weight percent.The tensile fracture morphology and distribution of SiC particles in the composites were observed by SEM(scanning electron microscope).It is found that SiC particle is uniformly and dispersedly distributed in the matrix alloy with absence of large cluster.Meanwhile,uniform distribution of nano-sized SiC particle plays the role in inhibiting or restraining the creation and propagation of crack in the composites.

关 键 词：机械搅拌 高能超声复合法 纳米SIC颗粒 铝基复合材料 

分 类 号：TB333[一般工业技术—材料科学与工程]