Impact of T6 heat treatment on the microstructure and mechanical characterization of Al7075-graphene nanoplatelets- Beryl hybrid composites

The T6 heat treatment of the aluminum 7075 alloy matrix composites reinforced with varying weight percentages of Graphene nanoplatelets (GNPs, 0.5, 1, 1.5 and 2 weight%) 6 weight% of Beryl (Be) is investigated in the current work. The T6 heat treatment is accomplished in an electric muffle furnace at 490 ± 5^o C for 2 h, followed by quenching. In the 7075 hybrid nanocomposites, the microstructure, ultimate tensile strength, fatigue analysis, and hardness of the graphene nanoplatelets (GNPs) are strengthened. Additionally, the beryl is reinforced in the hybrid nanocomposites. X-ray diffraction, universal testing machine, Brinell hardness tester, and scanning electron microscopy (SEM) are the methods that are utilised in this process. According to the findings of the microstructure study, the grain structure of Al7075 that has been subjected to heat treatment and ice quenching comprises the intermetallic phases and precipitates of MgZn2 in the matrix of Al7075. A significant increase in hardness can be noticed in the Al7075–6 Wt.%Beryl − 2 Wt.% GNPs, which is found to be 61% higher when compared to the Al7075 alloy matrix subjected to heat treatment. In comparison to the heat-treated Al7075 alloy matrix, it was discovered that the Al7075–6 Wt.%Beryl − 2 Wt.% GNPs exhibited an enhancement in tensile strength that was 85 per cent higher.In this study, the fatigue analysis of matrix and composites made of as-cast and heat-treated alloy was explored and analysed.