Multi-objective Optimization of Cold Upsetting Parameters for Aluminium Metal Matrix Composites

Hybrid aluminium metal matrix composites reinforced with 20 wt% of silicon carbide and 3 wt% of yttria at three different aspect ratios of 0.75, 1 and 1.25 was successfully fabricated through powder metallurgy. The state of reinforcements was examined through the X-ray diffraction analysis and scanning electron microscopy analysis. The cold upset experimentation was performed in the developed composites using the Taguchi’s L9 orthogonal design array by considering the aspect ratio, load and friction factor as the process parameters. After the experimentation, the responses (barrel radius and the workability) were calculated. A multi objective optimization was performed with the objective of maximum barrel radius and maximum workability with the help of grey relational analysis combined with Taguchi technique. The optimal process parameters were identified through the main effect plot and the significant parameters on the responses were identified with the analysis of variance.