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We report the fabrication of alumina (Al2O3) and silicon carbide (SiC) particulates reinforced Al metal matrix composites (Al MMCs) by stir casting method. The effect of reinforcement and heat treatment on the corrosion properties of Al matrix and r-Al MMCs were investigated by polarization, impedance and weight loss methods. Taguchi's experimental design method was employed to set the process parameters. In order to find the optimal process parameter levels, orthogonal arrays of Taguchi, the signal-to-noise (S/N) ratio, the analysis of variance (ANOVA), and regression analyses were employed. The analysis on the effect of these parameters on the corrosion rates has also been discussed. The results revealed that the rate of corrosion decrease with increase in the content of Al2O3 and SiC particulates in the r-Al MMCs. A significant enhancement in the corrosion resistance was observed with heat treated of Al alloy and its composites. The morphological analysis by SEM micrographs revealed the lesser formation of cavities due to corrosion upon the increase in Al2O3 content which would be beneficial for corrosive application.

The ferroelectric barium strontium titanate (Ba1-xSrxTiO3) is a homogeneous solid solution prepared from the mixture of barium titanate (BaTiO3), strontium titanate (SrTiO3) and titanium (IV) isopropoxide. Barium strontium titanate (BST) nanomaterials with improved permittivity and dielectric properties due to their nano-properties have attracted great interest for extensive and versatile applications as super capacitors, dielectrics, ceramics and catalysts. Introduction of metal ion dopants into the parent system of BST significantly alters its structural, morphological, electrical, optical and dielectric characteristics. This review is aimed at addressing synthesis, characterization methods, photocatalytic and electrical applications of metal ions doped BST nanomaterials. The effect of doping BST, through metal ions, on its properties and application with most probable reasons have been thoroughly discussed.