Processing and Tensile Testing of 2024 Al Matrix Composite Reinforced with Al 2 O 3 Nano-Particles (original) (raw)
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Production and mechanical properties of Al2O3 particle-reinforced 2024 aluminium alloy composites
Journal of Materials Processing Technology, 2005
2024 aluminium alloy metal matrix composites (MMCs) reinforced with three different sizes and weight fractions of Al 2 O 3 particles up to 30 wt.% were fabricated by a vortex method and subsequent applied pressure. The effects of Al 2 O 3 particle content and size of particle on the mechanical properties of the composites such as hardness and tensile strength were investigated. The density measurements showed that the samples contained little porosity, and the amount of porosity in the composites increased with increasing weight fraction and decreasing size of particles. Scanning electron microscopic observations of the microstructures revealed that the dispersion of the coarser sizes of particles was more uniform while finer particles led to agglomeration of the particles and porosity. The results show that the hardness and the tensile strength of the composites increased with decreasing size and increasing weight fraction of particles.
2007
In order to investigate the effect of nano-alumina on the microstructure and mechanical properties of Al/nanoAl2O3 composite, an innovative method was used in stir casting to avoid agglomeration and segregation of particles. Different volume fraction of nano-alumina particles were incorporated into the aluminum A356 alloy by a mechanical stirrer and cylindrical specimens at different temperatures were cast and tested. The microstructural characterization of the composite samples showed uniform distribution of reinforcement, grain refinement of aluminum matrix, and presence of the minimal porosity. The effects of Al2O3 particle content and casting temperature on the mechanical properties of the composites were investigated. Based on experiments, it was revealed that the presence of nanoAl2O3 reinforcement led to significant improvement in hardness, UTS and ductility. This combination of enhancement in UTS and ductility exhibited by nanoAl2O3 reinforced aluminum is due to uniform dist...