The squeeze-casting method is utilized to synthesize ZL109/Al2O3·SiO2 particle reinforced composites with 5%,10%,20%,30%(volume fraction) Al2O3·SiO2 particles,respectively. The microstructures and mechanical...The squeeze-casting method is utilized to synthesize ZL109/Al2O3·SiO2 particle reinforced composites with 5%,10%,20%,30%(volume fraction) Al2O3·SiO2 particles,respectively. The microstructures and mechanical behaviors of ZL109/Al2O3·SiO2 particle reinforced composites were studied,and the mechanical properties were tested. The results show that Al2O3·SiO2 particles can be homogeneously distributed on the aluminum matrix in this process. The hardnesses of the composites are higher than that of the Al matrix,and increases with increasing the volume fraction of Al2O3·SiO2 particles. The tensile strengths and elongations of the composites are lower than that of the Al matrix,and decrease with increasing the volume fraction of Al2O3·SiO2 particles. The fracture characteristics of the composites has an obvious change with increasing the volume fraction of Al2O3·SiO2 particles on the fracture section,the toughness dens become smaller and shallower,and the tearing ridges and "rivers" pattern appear. The fracture characteristics of the composites become fragile from ductile with the increase of the volume fraction of Al2O3·SiO2 particles. Elastic moduli of the composites have little change compared with the Al matrix.展开更多
A new preparation technique-"block dispersal and cast" method is introduced, and three kinds of powder mixing methods, vertical, horizontal and inclining styles, are compared. The results demonstrate that th...A new preparation technique-"block dispersal and cast" method is introduced, and three kinds of powder mixing methods, vertical, horizontal and inclining styles, are compared. The results demonstrate that the inclining style is the best way to mix powders. The Al and nano SiC powders are pressed into blocks, dipped into molten Al, stirred into mold so that SiC/Al matrix composites can be obtained at last. The microstructure of SiC particle reinforced Al matrix composite prepared by "block dispersal and cast" method have been studied using scanning electron microscopy (SEM). Phase analysis has also been conducted by means of X-ray diffraction (XRD). The results show that nano SiC particles can be dispersed uniformly in Al matrix. Thus, it is feasible to prepare SiC particle reinforced Al matrix composites by this method.展开更多
基金Projects (59571024) supported by the National Natural Science Foundation of China
文摘The squeeze-casting method is utilized to synthesize ZL109/Al2O3·SiO2 particle reinforced composites with 5%,10%,20%,30%(volume fraction) Al2O3·SiO2 particles,respectively. The microstructures and mechanical behaviors of ZL109/Al2O3·SiO2 particle reinforced composites were studied,and the mechanical properties were tested. The results show that Al2O3·SiO2 particles can be homogeneously distributed on the aluminum matrix in this process. The hardnesses of the composites are higher than that of the Al matrix,and increases with increasing the volume fraction of Al2O3·SiO2 particles. The tensile strengths and elongations of the composites are lower than that of the Al matrix,and decrease with increasing the volume fraction of Al2O3·SiO2 particles. The fracture characteristics of the composites has an obvious change with increasing the volume fraction of Al2O3·SiO2 particles on the fracture section,the toughness dens become smaller and shallower,and the tearing ridges and "rivers" pattern appear. The fracture characteristics of the composites become fragile from ductile with the increase of the volume fraction of Al2O3·SiO2 particles. Elastic moduli of the composites have little change compared with the Al matrix.
文摘A new preparation technique-"block dispersal and cast" method is introduced, and three kinds of powder mixing methods, vertical, horizontal and inclining styles, are compared. The results demonstrate that the inclining style is the best way to mix powders. The Al and nano SiC powders are pressed into blocks, dipped into molten Al, stirred into mold so that SiC/Al matrix composites can be obtained at last. The microstructure of SiC particle reinforced Al matrix composite prepared by "block dispersal and cast" method have been studied using scanning electron microscopy (SEM). Phase analysis has also been conducted by means of X-ray diffraction (XRD). The results show that nano SiC particles can be dispersed uniformly in Al matrix. Thus, it is feasible to prepare SiC particle reinforced Al matrix composites by this method.
