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进行了SiCp为10μm和150μm增强A356铝基复合材料的搅拌制备及75MPa下的挤压铸造,研究了颗粒尺寸对挤压铸造复合材料微观组织和力学性能的影响。结果表明,挤压铸造SiCp/A356铸件内部缺陷少、致密度高,颗粒团聚倾向小;铸态下,SiCp为10μm的10SiCp/A356复合材料的抗拉强度、硬度和伸长率均高于SiCp为150μm的10SiCp/A356的。T6热处理后,两者的力学性能均得到显著提高,SiCp为150μm的抗拉强度和硬度高于SiCp为10μm的。
The preparation of the A356 aluminum matrix composites reinforced with SiCp of 10μm and 150μm and the extrusion casting under 75MPa were carried out. The effects of particle size on the microstructure and mechanical properties of the extruded composites were investigated. The results show that the SiCp / A356 castings produced by squeeze casting have less internal defects, higher density and smaller agglomeration tendency. The tensile strength, hardness and elongation of 10SiCp / A356 with SiCp of 10μm are higher than that of SiCp 150 μm of 10SiCp / A356. T6 heat treatment, the mechanical properties of both have been significantly improved, SiCp 150μm tensile strength and hardness higher than SiCp 10μm.