Influence of hot extrusion on strain hardening behaviour of graphene platelets dispersed aluminium composites

Experimental work on the determination of strain hardening behaviour of Graphene Nano Platelets (GNPs) dispersed aluminium composites carried out during cold upsetting. The present work aimed to predict the effect of hot extrusion and GNPs content on strain hardening behaviour of aluminium composites. By varying the weight percentage of GNPs reinforcement from 0 to 2 wt %, aluminium composites prepared with powder metallurgy and hot extrusion technique. After each stage of deformation, each non-extruded and extruded GNP dispersed aluminium composites subjected to incremental compressive loading. The stress in axial and hoop direction, hydrostatic stress, instantaneous strain hardening exponent, and strength coefficient calculated for extruded and non-extruded GNPs dispersed aluminium composites. Found that tri-axial stresses, instantaneous strain hardening exponent, and strength coefficient have shown tremendous variation in their values for different weight percentage addition of GNPs and extrusion process. Further identified that extruded aluminium composites consisting of 1.5 wt % GNPs have a significant effect on influencing both strain hardening exponent and strength coefficient. (C) 2020 Elsevier B.V. All rights reserved.