Investigation on mechanical tribological and corrosion behaviour of SIC BN reinforced az91d magnesium hybrid composites

Abstract

The method of the stirring-squeeze cast technique was employed to newlinefabricate the SiC with variable weight percentages of 3%, 6%, and 9% and the newlineBN with a constant weight percentage of 3% particles with AZ91D alloy. The newlineinvestigations were carried out, on how the reinforcements influence the newlinemicrostructure, mechanical, and corrosion characteristics of synthesized newlinehybrid composites. The mechanical properties of the hybrid composites were newlineenhanced due to the formation of grain refinement and the primary (Mg) and newlinesecondary (Mg17Al12) phases created during the liquid forging process. For all newlinehybrid composite specimens, the compressive strength and tensile strength newlinehave been increased relatively with the increasing % of reinforcing particles. newlineThe results of the tensile and compressive tests suggested that adding SiC and newlineBN reinforcements to the base metal matrix will help the composites to newlineperform better by resisting external forces. ASTM- B117 standard has been newlineused to study the corrosion behaviour of hybrid composites. A pin-on-disc newlinewear tester has been utilized to conduct the wear test of hybrid composites. newlineThe coefficient of friction for the various load and sliding speeds over a newlineconstant sliding distance of 1000m, of synthesised magnesium hybrid newlinecomposites has been investigated in dry sliding conditions. The structural newlinecharacteristics of synthetic composites have been studied using a scanning newlineelectron microscope (SEM). The SEM pictures of the worn-out surfaces newlineshowed that particle microfracture was the main mechanism causing abrasive newlinewear. In addition, the wear resistance of magnesium hybrid composites has newlinegreatly increased due to the presence of stiffer and stronger reinforcements newlineparticles. newline