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| Study of Microstructure and Mechanical Properties of High Silicon Aluminum Alloy and Particle Reinforced Aluminum Matrix Composites |
| LIU Pei1, WANG Ai-qin1, HAO Shi-ming2, XIE Jing-pei1 |
1. School of Materials Science and Engineering, He’nan University of Science and Technology, Luoyang 471023, China
2. College of Physical Engineering, Zhengzhou University, Zhengzhou 450052, China |
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Abstract Al-30Si alloy, 30%Sip/Al, 30%SiCp/2024Al and 30%SiCp/6061Al composite materials were produced by?vacuum hot pressing sintering process. The coefficient of thermal expansion and mechanical properties of the composites were investigated. The microstructure and fracture appearance were characterized with SEM and EDS. The microstructure, mechanical properties and the fracture mechanism of high silicon aluminum alloy and particle reinforced aluminum matrix composites were explored. The results show that the SiC particles are evenly distributed in the 2024 aluminum matrix, the composite is compact and has the best properties. The coefficient of thermal expansion, hardness and the ultimate tensile strength of the composite are 13.69×10-6 /K, 134 HB and 353 MPa, respectively. There are a few pores in the SiCp/6061Al composite, the sintered density and uniformity of the composite are worse than SiCp/2024Al composite. The fracture modes of SiCp/6061Al and SiCp/2024Al composites are both tearing of interface matrix combined with breakage of SiC particles. Si particles are evenly distributed in the Sip/Al composite, the fracture mode of the composite is interface declutch, leading to poor performance. A large number of lath-shaped Si phase form in the Al-30Si alloy during the process of sintering, leading to the worst performance of the material.
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Received: 06 December 2013
Published: 08 August 2014
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2014, Vol. 24 
