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Copper-Coated Graphene Nanoplatelets-Reinforced Al–si Alloy Matrix Composites Fabricated by Stir Casting Method

Acta Metallurgica sinica(English Letters) 2021年第1期34卷 111-124页

作者： Xiaoqi Han Lizhuang Yang Naiqin Zhao Chunnian He School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin 300072China Joint School of National University of singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin UniversityTianjin 300072China

In this study,Cu nanoparticles-coated graphene nanoplatelets(Cu-NPs@GNPs)were synthesized by a simple in situ method with the assistance of Na Cl templates and used for reinforcing Al–10 si composites through stir casting *** experimental results showed that the coating of Cu-NPs on the GNPs could compromise the density mismatch between GNPs and metal matrix and eff ectively hinder the float of GNPs during *** reaction of Cu-NPs and Al matrix could protect the structural integrity of GNPs as well as improve the interfacial wettability between GNPs and the matrix,thus promoting the uniform dispersion of GNPs in the *** a result,the as-prepared 0.5 wt%Cu-NPs@GNPs/Al–10 si composite exhibited a tensile strength of 251 MPa(45%higher than the Al–10 si)with a total elongation of 15%.The strengthening eff ects were mainly attributed to the following three reasons:Firstly,the Cu-NPs coating improved the interfacial bonding between GNPs and Al matrix which promoted the load transfer from the matrix to the ***,the nanoscale Al 2 Cu formed by the reaction of Cu-NPs and Al matrix played a role in precipitation ***,GNPs refined the silicon phases and improved the monolithic performances of the composites.

关键词： Al–si alloy Graphene Stir casting Wettability si phase refinement

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