In the present research, the effect of micron sized graphite addition on the microstructure and tensile failure of Al6061 alloy has been studied. The Al6061 alloy metal matrix composites reinforced with 6, 9 and 12 varying weight percentages of graphite particles were fabricated by novel two step stir cast route which helps in improving the wettability of Al6061 alloy matrix with graphite particles. The synthesized composites were subjected to microstructural studies, density, hardness and tensile properties testing. Microstructural characterizations of obtained samples were carried out by SEM microscopy, EDS and XRD patterns. The occurrence of graphite particles were confirmed by the XRD patterns. The density and hardness of metal composites have been decreased with adding of graphite reinforcement, while the ultimate tensile strength and yield strengths were improved with the addition of graphite particles. There was increase in the elongation of the Al6061 alloy composite after the incorporation of the reinforcement. Various fracture mechanisms were observed in the Al6061-graphite composites using SEM.
An Al2014–alumina (Al2O3) composite’s
characteristics are significantly influenced by the reinforcement
particle size variation. Therefore, this study examines the microstructure,
mechanical, fractography, and wear performance of an Al2014–Al2O3p composite made using a unique two-stage stir
casting method and various alumina weight fractions (9, 12, and 15
wt %). Three categories of alumina particle size are used, i.e., fine
particle size (FPS, 8 μm), intermediate particle size (IPS,
53 μm), and coarse particle size (CPS, 88 μm). The shapes
of the composites were characterized using scanning electron microscopy.
According to scanning electron microscopic analyses of the microstructure,
the FPS dispersion was more uniform than IPS and CPS, whereas CPS
causes agglomeration. Additionally, the studies show that the FPS
composite outperformed CPS and IPS composites in terms of mechanical
characteristics and wear performance. The fractography study shows
conical and equiaxed dimple failure in the Al2014 matrix and the circular
cavities.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.