Abstract
The current investigation focuses on developing multilayered AA7075/SiC functionally graded material (FGM) with high hardness and impact toughness. The FGM was fabricated using a hot compaction powder metallurgy process. Critical process parameters such as compaction pressure, temperature, and holding time were optimized using Taguchi's L9 orthogonal array coupled with grey relational analysis. Charpy impact and Vickers hardness tests were performed to measure the toughness and microhardness of the specimens, respectively. The fabricated FGM samples were analyzed using SEM, EDS, and XRD to determine their morphology, fracture surface, elemental composition, and evolved phases. The results showed that parameter setting with a compaction pressure of 400 MPa, a temperature of 400 ℃, and a holding time of 15 min yielded the highest grey relational grade. The optimized parameter revealed an improvement of 25.05% and 28.08% in toughness and microhardness, respectively, compared to run no. 1. The microstructural analysis of the sample with optimum properties showed that the SiC reinforcement particles were evenly dispersed throughout the AA7075 matrix, and there was strong interfacial bonding between the layers of FGM. It was found that the mixed mode of brittle and ductile fracture can absorb impact energy before failure.
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