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为了研究不同粒径的Si C体积配比对SiC_p/Al基复合材料显微组织及拉伸性能的影响,采用高压扭转法(High-pressure torsion,HPT)将3.5μm(小)、7.0μm(大)SiC颗粒体积比分别为4∶1、1∶1、1∶4的SiC颗粒和纯Al粉末混合物制备成10%SiC_p/Al基复合材料(体积分数)。用金相显微镜、万能试验机、扫描电镜等分析2种粒径的Si C体积比对SiC_p/Al基复合材料显微组织和拉伸性能的影响。结果表明,随扭转半径增大,各试样的SiC颗粒分布更加均匀,颗粒团聚、偏聚现象减少,其中小、大SiC颗粒体积比为1∶1的试样性能最优,伸长率、相对密度最高,分别达到14.3%和99.1%,拉伸断裂形式为塑性断裂。
In order to study the influence of the volume fraction of Si C with different particle size on the microstructure and tensile properties of SiCp / Al matrix composites, high-pressure torsion (HPT) Large SiC particles with 4: 1, 1: 1, 1: 4 SiC particles and pure Al powder were prepared into 10% SiCp / Al matrix composites (volume fraction). The microstructure and tensile properties of SiC_p / Al matrix composites were analyzed by metallographic microscope, universal testing machine and scanning electron microscope. The results show that with the increase of torsional radius, the distribution of SiC particles in each sample is more uniform and the agglomeration and segregation of particles are reduced. The sample with the volume ratio of small and large SiC particles of 1: 1 has the best performance. The elongation, The highest relative density was 14.3% and 99.1% respectively, and the tensile fracture mode was plastic fracture.