Homogeneous magnesium alloy (ZK60) reinforced by low content of graphene nanoplatelets (GNPs) was fabricated by facile melt stirring and hot extrusion processes with cost effectiveness. GNPs were pre-dispersed with Mg powder and extruded into rods used as precursor for melting, which effectively guaranteed the integrity and dispersion of GNPs. In composites, GNPs closely combined with the magnesium matrix in nanoscale. Compared with ZK60 alloy, the composite with only 0.05 wt% GNPs can perform 62% enhancement in yield strength up to 256 MPa, exhibiting an ultra-high strengthening efficiency of 1550. Based on theoretical analysis, load transfer of GNPs contributed most (~ 72%) to the strength improvement of GNP/ZK60 composite, due to the 2D interfacial contacting and continuous combination of GNPs with matrix. This study explored the strengthening potential and mechanism of GNPs in metal matrix composites with insight of scale-up fabrication.

通过简便的熔融搅拌和热挤压工艺，以低成本实现了由低含量石墨烯纳米片（GNPs）增强的均相镁合金（ZK60）的制备。将GNPs预分散在Mg粉末中，然后挤入用作熔化前体的棒中，从而有效地保证了GNPs的完整性和分散性。在复合材料中，GNP在纳米级与镁基质紧密结合。与ZK60合金相比，仅含0.05 wt％GNP的复合材料在256 MPa以下时的屈服强度可提高62％，具有1550的超高强化效率。根据理论分析，GNP的载荷转移贡献最大（〜72 ％）GNP / ZK60复合材料的强度提高，这归因于GNP与基质的2D界面接触和连续结合。