The RGO/Al matrix composites were prepared by wet ball milling and repressing and re-sintering process

and the preparation parameters were designed by orthogonal experimental.The influence of the pressure and temperature on the relative density

micro-hardness and average grain size of the composites was analyzed by the intuitive and variance analysis.The optimized process parameters were obtained by comprehensive balance method as follows:the pre-compaction pressure of 350 MPa

the pre-sintering temperatures of 580℃

the recompacting pressure of 1 000 MPa and the resintering temperatures of 490℃.The microhardness

relative density

average grain size and tensile strength of the alloy prepared by the optimized process reach 69.5 HV

99.81%

16.05μm and 212.87 MPa

respectively.Microstructure analysis reveals that graphene is mainly distributed in grain boundaries of aluminum grains and played a role of fine grain strengthening.