碳化硅增强铝基复合材料的力学性能和断裂机制

Effects of SiC particle size on tensile property and fracture behavior on particle reinforced aluminum metal matrix composites

研究了碳化硅颗粒(SiC_p)尺寸对用粉末冶金法制备体积分数为15%的SiC_p/2009铝基复合材料力学性能和断裂机制的影响.结果表明,复合材料的强度随着SiC_p尺寸的增大而减小,塑性则随着颗粒的增大而增大.当SiC_p尺寸为1.5μm时,SiC_p/2009Al复合材料的断裂主要以界面处撕裂和基体材料的开裂为主;当SiC_p尺寸为20μm时,复合材料的断裂主要以SiC_p断裂为主;当SiC_p尺寸处于两者之间时,SiC_p/2009Al复合材料界面处撕裂和SiC_p断裂的共同作用决定复合材料的断裂.

In this paper the tensile properties and fracture behaviour of aluminum alloy 2009 reinforced with silicon carbide particulates （SiCp） fabricated via elemental powder metallurgical technique were presented. The results indicate that the strength of 15%SIC/2009Al composite decrease with increasing particulates size, but ductility inversely. When particulates were 1.5um, the breakage is due to tearing of matrix near interface. The failure of composites with 20um particulate results from crack of SiCp. When particulates are between above sizes, the failure of composite results from tearing of matrix near interface and crack of SiCp.