Abstract
In order to further improve the comprehensive mechanical properties of commercial AZ31 Mg alloy, AZ31/graphene nano particulates (GNP) composites were prepared by AZ31 Mg alloy and graphene through friction stir processing (FSP) and following rolling. The microstructure and mechanical properties of as-FSPed and as-rolled alloys were investigated in this study. Compared with base metal, the ductility of FSPed alloys is greatly increased, while the strength is somewhat decreased. After further rolling on the FSPed plate, the strength of the alloy is improved. AZ31/GNP composites processed by FSP and rolling (50% reduction ratio) exhibits excellent mechanical properties with ultimate tensile strength of 296 MPa and elongation of 15.7%. The improved performance is attributed to the refinement of the grain and the homogenization of the second phase, which are the result of the severe plastic deformation characteristics of FSP. The multiplication of dislocations originated from rolling deformation and the reinforcement of GNP also contribute to the strength. The results verify that FSP as an intermediate step before rolling can be used as an effective mean to add reinforcement particles. On the other hand, the improved microstructure induced by severe plastic deformation of FSP is beneficial for further rolling.
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