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颗粒尺寸对SiCp/6061Al复合材料组织及性能的影响 被引量:8

Effect of Particle Size on Microstructure and Properties of SiCp /6061Al Composite
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摘要 选用冷等静压+烧结+热挤压的方法,制备了增强体Si C颗粒体积分数为35%时,4种不同Si C颗粒尺寸(7.5μm、15.0μm、25.0μm、40.0μm)的Si Cp/6061Al复合材料。测定了复合材料的热膨胀系数及力学性能。利用扫描电镜对复合材料微观组织进行了表征,探究了增强体颗粒尺寸对Si Cp/6061Al复合材料组织和性能的影响。由分析结果可知:复合材料中Si C颗粒分布比较均匀,且随着Si C颗粒尺寸的增大,其在基体中分布的均匀度得到提升。此外,当Si C颗粒尺寸逐步减小时,Si Cp/6061Al复合材料的抗拉强度值也逐渐增大,热膨胀系数也越低。当Si C颗粒尺寸为7.5μm时,复合材料的断裂主要以界面处撕裂和基体材料的开裂为主。当Si C颗粒尺寸为40.0μm的时候,复合材料断裂主要以Si C颗粒断裂为主。当颗粒尺寸处于两者之间时,复合材料界面撕裂和Si C颗粒断裂的共同作用决定复合材料的断裂。 In this paper,35% SiC particles reinforced 6061 Al composites with four different particle sizes( 7.5 μm,15. 0 μm,25. 0 μm and 40. 0 μm) were fabricated by a powder metallurgy method which was cold isostatic pressing,then solid state sintering,and hot extrusion. The coefficient of thermal expansion( CTE) and tensile strength were examined. The microsructure of composites was characterized by scaning electron microscopy. The effects of SiC particle sizes on the microstructure and properties of composites were analyzed.The results show that the SiC particles are homogeneously distributed in the SiCp /6061 Al composites. With the increasing of SiC particle size,the distribution of SiC particles in the composites is more uniformly. With the decreasing of SiC particles,the CTE of composites decreases,and the tensile strength increases. When the SiC particle size is 7. 5 μm,the breakage is due to tearing of matrix near interface. The fracture of composites with40 μm particle size results from the crack of SiC particle. When the particle size is between 4. 0 μm and 7. 5μm,the fracture of composite results from tearing of matrix near interface and crack of SiC particle.
出处 《河南科技大学学报(自然科学版)》 CAS 北大核心 2015年第6期1-4,9,共5页 Journal of Henan University of Science And Technology:Natural Science
基金 国家自然科学基金项目(51371077)
关键词 粉末冶金 复合材料 颗粒尺寸 热膨胀 抗拉强度 powder metallurgical composite particle size thermal expansion tensile strength
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