▎ 摘　　要

Reduced graphene oxide (RGO) reinforced copper matrix composites (RGO/Cu composites) with volume fractions of RGO from 0.6 to 4.8 vol.% were produced based on a molecular-level mixing method (MLM). High-shear mixing was introduced in the process of MLM by using a rotor-stator mixer, which could make the RGO sheets distributed in the composite more homogeneous and improve the properties of the composites. The MLM method integrated with high shear mixing is abbreviated as M-H. The effect of high-shear mixing on the mechanical properties of the composites with different volume fractions of graphene was studied. The yield strength of the 2.4 vol.% RGO/Cu composite produced by M-H method is 501.3 MPa, which is more than three times higher than that of the Cu matrix. RGO shows extremely high strengthening effect; the apparent strengthening efficiency of RGO in the 0.6 vol.% RGO/Cu composite is as high as 321.7, even higher than CNTs. The results show that the M-H method is hopeful to be applied to produce many kinds of graphene based composites.