THE DAMAGE TOLERANCE OF AL-SI-MG ALLOY REINFORCED WITH PERIWINKLE SHELL AND MANGIFERA INDICA PARTICULATES

Chibuzo N. Okoye, Paul C. Okolie, Benjamin S. Oluwadare, Chidume N. Nwambu

Abstract


The damage tolerance of Al-12wt%-2wt%Mg based biocomposites containing different concentrations of periwinkle shell and Mangifera indica particulates (PSp and MIp) have been explored experimentally. The effects of hybrid concentrations on the damage tolerance were also investigated. The structural analysis of the developed biocomposites was done using scanning electron microscopy (SEM). The statistical significant effects of the reinforcements and their hybrids on the damage tolerance were established using Response surface optimal design (RSOD) and the optimal composition obtained and validated. The biocomposites demonstrated excellent damage tolerance at different concentrations of the reinforcements with maximum of hardness151 BHN obtained by Al-12wt%-2wt%Mg-6PSp-2wt%MIp biocomposite. The biocomposite recorded higher hardness than the alloy matrix. The improvements of property are guaranteed by the distribution of PSp and MIp particles in the alloy matrix as evidenced in the microstructural analysis. The statistical data revealed that PSp and MIp have significant effects on the tested properties. The optimization results revealed Al-12wt%Si-2wt%Mg-11wt%PSp-0.281wt%MIp as the optimal composition.

KEYWORDS:  Aluminium, Magnesium, Periwinkle Shell, Mangifera indica, damage tolerance.


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