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摘要
In the present study, hot forward extrusion-equal channel angular pressing (FE-ECAP) and also hot forward extrusion processes, were used for consolidation of Al-SiC(p) premixed powders. The effect of the consolidation method on the distribution of SiC particles and also the physical and mechanical properties of the produced composites was investigated. Optical microscope was used to determine the SiC particles distribution in the Al matrix of the composites produced by the two mentioned processes. To determine SiC particles distribution, the quadrat method was also used. Mechanical properties of the composites were determined using tensile and hardness tests. The densities of the samples were also measured to evaluate the performance of the consolidation processes which were used. The results show that the ultimate tensile strength and ductility of the Al-10 vol% SiC composites produced by FE-ECAP process are 148 MPa and 21.6%, respectively, and also the same properties for FE samples are 136 MPa and 16.6%, respectively, which shows an increase in the strength and ductility for the composites produced by FE-ECAP process. The optical micrographs of the consolidated metal matrix composites (MMCs) through the FE-ECAP process show finely distributed reinforcement particles, due to shear deformation in ECAP stage which also proved by the quadrat method as compared to the FE process fabricated samples. This feature of FE-ECAP method leads to higher ductility in comparison with FE method. The relative density of FE-ECAP and FE samples for the same composition of 10 vol% SiC and process conditions are 99.2% and 96%, respectively, which is the strong evidence in better consolidation through FE-ECAP process.
- 出版日期2010-3-4
