| Statistical evaluation of strength has been performed for SiC particle reinforced Al base composites made by two fabrication processes in order to predict their reliability. In the case of compocast SiC_P/A356 Al composites, it was found that both tensile strength and elongation of hot extruded composites are much higher than those of as-cast composites. This might be associated with the reduction of defects in the matrix and the homogeneous distribution of the SiC particles due to reorientation of the particles along the extrusion direction. Statistical evaluation of strength for these composites indicated that the scatter in tensile strength of extruded composites were remarkable decreased in comparison with the as-compocast composites. In particular. the weibull modulus was highly increased due to the extrusion process. In the case of SiC_P/2024Al composites by P/M process, the tensile strength of the composites was increased with volume fraction of SiC particle. However, it was found that. the scatter of tensile strength is increased as volume fraction of SiC particles increases. The Weibull modulus of the composites tents to gradually decrease by adding SiC particles into the matrix, exhibiting ductile to brittle fracture mode. The weibull modulus, m, was 25 in the composites with 20 Vol.% SiC particle, 43 in the 2024 matrix, respectively. |
|
