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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Effect of particle size on mechanical properties of SiCp/5210 Al metal matrix composite
YU Xiao-dong(于晓东), WANG Yang-wei(王扬卫), WANG Fu-chi(王富耻)

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China

Abstract:SiCp/5210 Al metal matrix composites with a high volume fraction (50%) of SiC particles were fabricated by squeeze casting method. The effect of particle size on the mechanical properties of the composites was studied. The results show that with the decreasing of particle size, the bending strength of the composites increases, while the fracture toughness of the composites decreases. The bending strength and fracture toughness of 10 μm SiCp/5210 Al metal matrix composite are 825 MPa, 10.0 MPa∙m1/2, and the fracture toughness of 63 μm SiCp/5210 Al metal matrix composite reaches 12.8 MPa·m1/2. The main fracture mechanism changes from particle crack to particle/matrix interface de-bonding with the decreasing of particle size.

 

Key words: metal matrix composite; SiCp/5210 composite; squeeze casting; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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