Effect of grain refiner, modifier and graphene on the mechanical properties of hyper eutectic Al-Si alloys by experimental and numerical investigation

Abstract

The present work focuses on the study of mechanical properties of die cast hypereutectic Al-16Si alloys that are subjected to grain refinement and modification. It further deals with the study of the influence of the reinforcement of graphene to the sample that is simultaneously grain refined and modified. Hyper eutectic Al-16Si alloys are die casted with five different compositions. The Vickers hardness test and tensile strength test are performed on the all the casted samples. The Optical microstructure examination of the specimens is performed. The numerical simulation data derived from finite element analysis of the tensile test is validated against experimental tensile test results and both were found to coincide. Using experimental data, two alternative constitutive models, namely the modified Johnson Cook (m-JC) model and the integrated JC-ZA model, were formulated on the investigated materials for precise flow stress behaviour prediction. The JC-ZA model's integration is expected to improve prediction power in relevant consideration conditions.