Microstructure, mechanical properties and corrosion resistance of AZ31/GNPs composites prepared by friction stir processing

The graphene nano-platelets (GNPs) reinforced AZ31 alloy composites were fabricated by friction stir processing (FSP) with three multi-pass and high rotation speed. The AZ31/2.14 vol% GNPs and AZ31/6.43 vol% GNPs composites were designed. The fine microstructure and uniform dispersion of GNPs were observed in the AZ31/GNPs composites. The hardness and tensile properties were enhanced after three cumulative FSP passes. This was attributed to grain refinement and strengthening effects of GNPs. The corrosion resistance of the AZ31/GNPs composites was improved due grain refinement, distribution of beta-Al12Mg17 phase and anti-corrosion effect of GNPs. The tensile properties and corrosion resistance of the AZ31/6.43 vol% GNPs composite increased with increasing the volume fraction of the GNPs. (C) 2021 The Authors. Published by Elsevier B.V.

Automated summary

The study fabricated graphene nano-platelets (GNPs) reinforced AZ31 alloy composites through friction stir processing, with observed uniform dispersion of GNPs in the composites. After three cumulative FSP passes, the hardness and tensile properties were enhanced, and the corrosion resistance was improved with increasing the volume fraction of GNPs.