TAGRA 2024

The primary goal of the study is to create an Aluminium A356 Functionally Graded alloy (A356 FG alloy) by vertical centrifugal casting after stir casting. After T6 heat treatment at various aging temperatures, the optimal aging temperature was determined to be 165°C. Using Vickers' microhardness instrument, the hardness was determined to be 50% greater in the higher hardness zone (Outer zone) for the sample aged at 165°C compared to the as-cast Aluminum functionally graded alloy. Also, the tensile strength evaluation showed the highest tensile strength of 101.487 N/mm² in the 165°C aged higher hardness zone. The microstructure was analyzed, and it was discovered that the heat-treated condition contained spheroidized eutectic silicon and magnesium silicide particles.
The secondary investigation spatially dispersed high-hardness silicon nitride particles with Aluminium A356 alloy via vertical centrifugal casting to reinforce A356 with 10 wt.% Si₃N₄ Functionally Graded Composite (A356-10 wt.% Si₃N₄ FG Composite). On the fabricated FG composite, the optimal T6 heat treatment conditions obtained from the A356 FG alloy were implemented. Using Vicker's microhardness instrument, the hardness behavior was assessed. It was determined that the exterior surface exhibited a superior microhardness of 182 HV, which constituted a 73% increase compared to the interior surface. Also, the tensile strength evaluation showed the highest tensile strength of 131.067 N/mm² in the wealthy ceramic zone. The phase analysis and particle dissemination of the gradient were validated in the radial direction.