Authors:
V. V. D. Sahithi,N. Srilatha,Yuhan Wang,DOI NO:
https://doi.org/10.26782/jmcms.2026.07.00003Keywords:
Fly Ash Composites,Metal Matrix Composites,GRA,Process Innovation,Hybrid reinforcement,Taguchi optimization,Silicon Carbide,Abstract
The hybrid aluminium matrix composites comprising AA7075 as matrix material reinforced by silicon carbide (SiC) and fly ash (FA) were produced by the stir casting process in order to study the effect of the combination of ceramic and industrial waste reinforcements on the mechanical properties. Ten composite compositions were produced by changing the amounts of SiC and FA. The obtained composites were subjected to Ultimate Tensile Strength (UTS), Impact Strength (IS), and Micro Vickers Hardness (MVH) tests. It was found that the range of UTS was 163.56-218.08 MPa, IS was 31.35-90.25 J, and MVH was 79.61-93.18 kgf/mm². This shows the effect of the composition of the reinforcement on the mechanical properties of the composites. Since more than one property was optimized in the present study, Grey Relational Analysis (GRA) was used to turn the multi-response optimization into a single parameter of GRG. These responses were normalized with the higher-the-better rule, and then the deviation series, grey relational coefficient, and GRG values were calculated for ranking the composite mixes. Of all the tested specimens, the one with the highest value of GRG (0.912) was specimen C9 (AA7075 + 9 wt.% SiC + 3 wt.% FA), which showed excellent mechanical properties in terms of tensile strength, impact strength, and hardness. It can be concluded that the incorporation of the materials of interest together with fly ash has greatly improved the mechanical properties of the AA7075-based hybrid composites. Hence, GRA can be effectively used for multi-objective optimization.Refference:
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