Development and characterization of microstructure, mechanical and thermal behavior of AA-2219-Al2O3 MMCs for I. C. engine application

Aluminium alloy AA2219 is a high strength alloy known for its great mechanical properties and superior performance at high temperatures. The current study examines the impact of alumina micron particles on the microstructure, tensile stress, elongation, yield stress, hardness, impact strength, thermal conductivity, and thermal expansion of AA2219 reinforced with Al 2 O 3 at weight percentages ranging from 3 to 12 wt% of composites. The convectional and cost-effective stir casting procedure used to create the AA2219-alumina composite. Micro-structure investigation using optical and SEM predicts the production of dendritic structure throughout the AA2219 with alumina composite, as well as the uniform dispersion of ceramic particles in the matrix AA2219 due to the vortex created in the two stages of stir speed 150–300 rpm during casting. It was found that increasing the alumina ceramic particles from 3 to 12 wt% improved mechanical properties by 25–30% while decreasing thermal conductivity by 35.6%. The coefficient of thermal expansion was reduced (26.15%) when the temperature increased from 100 to 500 degrees Celsius and the amount of alumina in the matrix AA2219. The developed AA2219-Alumina composite is recommended for usage in airplane fuselages, fuel tanks, I.C. engine outlet valves, and other high-temperature components.