Whereas, the 1 wt% Mn added alloy has uniformly distributed fine eutectic and primary Si particles with blunt corners. As-cast Al–12.6Si–0.0Mn alloy has a non-uniformly distributed coarser and irregular shape primary and eutectic silicon particles inside the α-Al phase, and both the Si phase have very sharp corners. R2 value for the outer region was 99.24%, indicating that the developed model is accurate and fits very well with experimental values.Įffect of manganese (Mn) addition (0.0, 1.0, 2.0 and 3 wt%) on the microstructural morphology, hardness, tensile properties and fracture behaviour of the gravity cast eutectic Al–12.6Si alloy has been studied through XRD analysis, chemical analysis, optical metallography, FESEM analysis, energy dispersive spectroscopy analysis, hardness test, tensile test and quantitative phase analysis.

ANOVA was done to find the most influencing parameter on hardness. SEM images were also used to characterize the FGACC. Porosity values were 1.8% in the outer region and 2.97% in the inner region. Archimedes principle was used to find the density based on which the porosity was calculated. Hardness increased by 30 and 22% in outer for 3 and 30 µm. Rockwell hardness values increased from the inner to the outer region ensuring the gradual increase in Si3N4. This is due to the radial forces generated from centrifugal casting to segregate a second discrete phase from the matrix of composite materials. It was observed that the Si3N4 concentration increases from the inner to the outer periphery of the casted ring. Image Analyser software was used analyze the volume fraction of phase and grain size for all FGACCs. The gradual change in the distribution of reinforcement of the casted FGACC is ensured using optical microscope SEM and hardness. Centrifugal casting was carried out based on L4 orthogonal array.

Si3N4 is varied in size of 30 and 3 µm and volume fraction of 8% and 12%.

This enables the material to have the best of both materials. LM6 aluminum alloy and silicon nitride (Si3N4) are mixed to form FGACC. The main objective of this work is the fabrication of functionally graded aluminum ceramic composite (FGACC) using centrifugal casting and to study its physical and mechanical properties.

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