Fabrication and Strengthening Behavior of Few-layer Graphene Reinforced Al Matrix Composites
The graphene oxide(GO)sheets were prepared by modified Hummers method.They are homogenously covering on the surface of Al powders and connecting as unique network.After densification by spark plasma sintering,the GO was effectively reduced to the reduced graphene oxide(r-GO)and the dense r-GO/Al composites were simultaneously prepared.High-resolution transmission electron microscope(HRTEM)confirmed r-GO platelet as few-layer graphene(FLG,< 10 layers),which was sandwiched between the thin Al2O3 layers.Due to its flexibility,the FLG 3D-network was homogenously filled to the curved grain boundaries.However,this network structure was rearranged by plastic flow of Al during subsequent hot extrusion.The continual FLG network was tightly contacted with the matrix,and mostly aligned to a single direction.According to the HRTEM micrographs and shear-lag model,the tensile responses of FLG/Al composites with various FLG concentrations were discussed.It was demonstrated that the strength enhancement of Al matrix was mainly due to the effective load transfer of FLG rather than other strengthening factors(e.g.,grain refinement,processing-induced work hardening,thermal mismatch,and the pinning effect of destroyed GPL structures or interfacial impurities).
Few-layer graphene Metal matrix composites (MMCs) Strengthening Dispersion Interfaces
Weiwei Zhou Keiko Kikuchi Naoyuki Nomura Akira Kawasaki
Department of Materials Processing,Graduate School of Engineering,Tohoku University,Sendai 980-8579,Japan
国际会议
北京
英文
1088-1091
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）