3D-networks of few-layer graphene (FLG) platelets at grain boundaries, sandwiched between thin amorphous Al2O3 layers, were fabricated by spark plasma sintering (SPS) of graphene oxide (GO)/Al mixed powders. The GO was prepared by a modified Hummers’ method, and was thermally reduced to FLG simultaneously during SPS densification. Subsequent plastic flow of the Al matrix during the hot extrusion process caused the destruction of this structure, rearranged the FLG platelets individually into the uniaxial direction, and made them incorporate in the Al matrix. Observations by high-resolution transmission electron microscopy proved the existence of a direct-contact interface between the FLG and the Al matrix without any interfacial compounds, and revealed that the Al matrix featured a fairly low dislocation density. Consequently, the mechanical strength of Al matrix was noticeably enhanced by FLG incorporation, agreeing with the potential strengthening effect predicted by the load transfer mechanism.

通过氧化石墨烯（GO）/ Al混合粉末的火花等离子体烧结（SPS），制造了夹在薄的无定形Al2O3层之间的，在晶界处的几层石墨烯（FLG）血小板的3D网络。GO采用改良的Hummers方法制备，并在SPS致密化过程中同时热还原为FLG。在热挤压过程中，Al基体随后的塑性流动导致该结构的破坏，将FLG血小板分别重新排列到单轴方向上，并使其掺入Al基体中。高分辨率透射电子显微镜的观察证明，FLG和Al基质之间存在直接接触的界面，没有任何界面化合物，并且揭示了Al基质具有相当低的位错密度。所以，