Materials Transactions Online

Materials Transactions, Vol.55 No.05 (2014) pp.750-753
© 2014 The Japan Institute of Metals and Materials

Preparation, Properties and Microstructure of SiC Particle Reinforced Al-Si Matrix Composite

Shiming Hao1, 3, Jingpei Xie2, Aiqin Wang2 and Ming Fang2

1School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471003, China
2College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China
3Physical Engineering College and Laboratory of Materials Physics of the Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China

The SiC particles reinforced Al-30Si matrix composite was fabricated by vacuum hot pressing techniques. Mechanical properties of the composite were measured, and the microstructure was observed using SEM, XRD, and TEM. The results show that SiC particles and Si particles were dispersed uniformly in the matrix, the interfaces of the SiC/Si, SiC/Al, and the Si/Al are good and did not find the formation of Al4C3; composites have a low coefficient of thermal expansion (10.4 × 10−6 K−1) and decent tensile strength (192 MPa). The analysis of the fractograph reveals the fracture mechanism of SiC particle reinforced Al-Si matrix composite. The fracture of composite is primarily dominated by the fracture of brittle Si/SiC particles and the subsequent link up of damage through the matrix.

(Received 2013/12/27; Accepted 2014/02/13; Published 2014/04/25)

Keywords: aluminum-silicon matrix composite, microstructure, tensile strength, thermal expansion coefficient, vacuum hot pressing

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