Investigations on mechanical and wear properties of AA7075 SiC Gr surface hybrid composites

Abstract

Internationally numerous applications in the field of aerospace and structural constructions are evident of using metal matrix composites as a suitable alternative for traditional materials In this research work the suitability of AA7075 SiC Gr composites were examined for wear based applications The preparation of AA7075 SiC Gr surface hybrid composites were carried by friction stir processing technique The complete homogeneity of reinforcing medium into the base metal was ensured from scanning electron microscopy Energy dispersive X ray spectroscopy The aerospace applications involve high load bearing capacity and corrosive resistance in their components The same theme is considered in this work namely hardness tensile impact properties and corrosion properties The wear parameters of the composites were optimized by using L16 orthogonal array The orthogonal Taguchi L16 array design was used to perform wear behaviour analysis Dry sliding wear behaviour of the surface hybrid composites were examined by using Pin on disc apparatus for identifying influential process parameters Optimum results of lower wear rate as well as coefficient of friction were observed for the combination of SiC reinforcement by 10 wt Again the worn surfaces were examined by using SEM for the influence of various parameter combinations and SEM morphology of the wear debris are inferred the abrasive wear mechanism Potentio dynamic polarization techniques were used for examining the corrosion nature of surface hybrid composite The different samples have similar anodic polarization curves and passivation potentials In the medium of 3 5 wt NaCl solution base material exhibited low susceptibility to pitting The surface morphology after corrosion test was examined by SEM The results reveal a great improvement in strength when compared with the base material newline