Selection of material in engineering design process is a difficult and elusive task due to enormous number of dissimilar materials availability. For effective selection of materials, the designers have to take into account a number of definite qualitative and quantitative criteria. In the same context, this paper proposes a hybrid TOPSIS-PSI approach for effective material selection in marine applications. In this paper, the selection index value has been calculated by using logical combination of PSI and TOPSIS algorithm and these values have been ranked in ascending or descending order. The highest preference selection index value has been taken as the best alternative for the marine application. To prove the effectiveness of the proposed hybrid TOPSIS-PSI algorithm, two practical examples are considered and the result shows that the proposed procedure provides satisfactory results when compared with past literature. Furthermore, hybrid procedure is performed for selection of best wt.% combination among hybrid aluminum nanocomposites for marine applications based on its physical, mechanical and corrosive behavior. The result reveals that 9 wt.% and 6 wt.% reinforced hybrid aluminum nanocomposites have optimum combination of all physical, mechanical and corrosion properties, respectively according to hybrid TOPSIS-PSI approach.

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Marine conditions are highly contentious for most materials manifested by the decayed condition of old ships and wrecks (made up of steel/wood). This work investigates the mechanical and corrosion behavior of aluminum-based composites reinforced with 3, 6, and 9 wt% of hybrid reinforcements (SiC, graphite, and ZrO2). It was observed that 3 wt% reinforcement composite had the optimum mechanical properties along with minimum corrosion rate. This composition had the least void contents, and its micro-hardness increased by 27.5% (42.6 VHN) in comparison to that of the unreinforced Al (33.3 VHN). Impact strength of the composite increased by 27.2% for 6 wt% hybrid reinforcement (247.1 J) and then started decreasing, whereas tensile strength of the composite increased by 8% for 9 wt% hybrid reinforcement (124.0 MPa) with respect to that of pure Al. The flexural strength of the pure Al reduced with the addition of hard reinforcing particles. The corrosion behavior of the composite was analyzed in 3.5% NaCl solution (simulating the seawater condition) at room temperature with the help of Tafel polarization curve and scanning electron microscopy (SEM) micrographs. It revealed that the 3% reinforced composite had the minimum corrosion current density (0.4 μA) and corrosion rate (0.23 mpy) compared to those of pure Al. The surface morphology of corrosion tested samples indicated the pitting corrosion mechanism.