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CAI Xiang, ZHANG Hui, CHEN Shuang. Microstructure and Properties of SiCp/Al Composite Prepared by Powder Extrusion Forming[J]. Materials and Mechanical Engineering, 2017, 41(7): 43-48,53. DOI: 10.11973/jxgccl201707009
Citation: CAI Xiang, ZHANG Hui, CHEN Shuang. Microstructure and Properties of SiCp/Al Composite Prepared by Powder Extrusion Forming[J]. Materials and Mechanical Engineering, 2017, 41(7): 43-48,53. DOI: 10.11973/jxgccl201707009

Microstructure and Properties of SiCp/Al Composite Prepared by Powder Extrusion Forming

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  • Received Date: June 05, 2016
  • Revised Date: May 24, 2017
  • The SiCp/Al composites with SiC volume fraction of 30%, 40% and 50% were prepared by powder extrusion forming. The microstructure, mechanical properties and physical properties of different SiCp/Al composites were analyzed by optical microscopy, scanning electron microscopy, tensile tester, brinell hardness tester, thermodilatometer and thermal conductivity detector. The results showed that 30% and 40% SiCp/Al composites could be extruded in 450℃, but 50% SiCp/Al composite failed. On longitudinal section of composite, the aluminum matrix was distributed along the extrusion direction and presented the white strip streamline structure. The tensile fracture surface of two composites was made up of a large number of smaller dimples, both of which presented mixed fracture characteristics. With increase of SiCp volume fraction, the brinell hardness increased from 81.9 HB to 98 HB while tensile strength decreased slightly and the elongation reduced obviously. The relative density and coefficient of linear expansion of the composite reduced while thermal conductivity improved.
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