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| Effect of CeO2 content on microstructure and mechanical properties of SiC particle reinforced aluminum matrix composites |
| ZHU Peng-fei1，XIE Jing-pei1,2，WANG Ai-qin1,2，LI Jian-yun1 |
（1. College of Materials Science and Engineering， He’nan University of Science and Technology， Luoyang 471023， China
2. He’nan Province Nonferrous Metal General Technology Collaborative Innovation Center， Luoyang 471023， China） |
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Abstract In order to study the effect of CeO2 on microstructure and mechanical properties of SiCp/Al-12Si composites， the composites were prepared by powder metallurgy method with micro-sized SiC particles and Al-12Si-Cu-Mg alloy powder as raw materials and CeO2 powder added. The microstructure of the material was characterized and analyzed by SEM and EDS， and its physical and mechanical properties were tested. The results show that the addition of appropriate CeO2 can significantly refine the precipitated Si， and the distribution of Si phase particles is more uniform. The density， tensile strength and elongation of the composite are significantly improved， and the coefficient of thermal expansion is significantly reduced. When the volume fraction of CeO2 is 0.2%， the properties of the composite reach the optimal values， which are 98.38%， 376.9 MPa， 4.09 % and 13.94×10-6 K-1， respectively.
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Received: 19 January 2017
Published: 29 August 2018
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2018, Vol. 28 
