Mechanical Properties and Fracture Mechanism of SiC Particle Reinforced Aluminum Metal Matrix Composites

Xie Jingpei; Wang Hang; Wang Aiqin; Hao Shiming

doi:10.15980/j.tzzz.2014.04.005

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Mechanical Properties and Fracture Mechanism of SiC Particle Reinforced Aluminum Metal Matrix Composites
Vol. 34, Issue 4, Pages: 430-433(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.04.005

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[1]谢敬佩,王行,王爱琴,郝世明.SiC_p增强铝基复合材料的力学性能和断裂机理[J].特种铸造及有色合金,2014,34(04):430-433.

Xie Jingpei, Wang Hang, Wang Aiqin, et al. Mechanical Properties and Fracture Mechanism of SiC Particle Reinforced Aluminum Metal Matrix Composites. [J]. Special Casting & Nonferrous Alloys 34(4):430-433(2014)
[1]谢敬佩,王行,王爱琴,郝世明.SiC_p增强铝基复合材料的力学性能和断裂机理[J].特种铸造及有色合金,2014,34(04):430-433. DOI： 10.15980/j.tzzz.2014.04.005.

Xie Jingpei, Wang Hang, Wang Aiqin, et al. Mechanical Properties and Fracture Mechanism of SiC Particle Reinforced Aluminum Metal Matrix Composites. [J]. Special Casting & Nonferrous Alloys 34(4):430-433(2014) DOI： 10.15980/j.tzzz.2014.04.005.

摘要

采用真空热压法制备了SiCp的体积含量为30%的SiCp/2024Al复合材料

研究了SiCp粒径对复合材料组织及性能的影响。结果表明

颗粒粒径从3.5μm增大到40μm

复合材料的抗拉强度和硬度减小

伸长率和断面收缩率增大

增强体颗粒在基体中分布越来越均匀。当SiCp粒径为25μm时

复合材料的致密度最高。复合材料的断裂由SiCp的断裂、界面处撕裂和基体的开裂等几种机理共同影响。随着颗粒粒径的增大

复合材料断裂由界面处撕裂和基体开裂转变为SiCp断裂。

Abstract

Effects of 30% SiC particle with various sizes on microstructure and properties of aluminum matrix composites which were prepared by vacuum hot pressing sintering were investigated.The results indicate that with increasing particulate size from 3.5μm to 40μm

tensile strength and hardness of the composite are decreased

while elongation and section shrinkage rate are increased

meanwhile

reinforcing particles are more uniformly distributed in the matrix.The maximum relative density of the composites prepared can be observed with SiC particles size in 25μm.The fracture mechanism of the composites prepared is characterized by SiC particle crack

tearing of matrix near interface and matrix crack. With increasing in particulate size

the failure mode of the composites is transformed from tearing of matrix near interface and matrix crack into crack of SiC particle.