Fabrication and Characterization of Bimodal Size Al2O3p Reinforced 7075 Aluminium Matrix Composites
Bimodal sized (Nano and Micron) Al2O3 particle-reinforced 7075Al matrix composites were prepared by a new method called rotary stirring-injection process. The Al2O3 particles were injected into the molten 7075 alloy through the flows of inert argon gas, and the rotary stirring was used simultaneously. The effect of bimodal sized Al2O3 particles reinforcement with average size of 30–100 nm, 3–5 μm and volume fraction of 1 %, 4 % on microstructure, hardness and tribological properties of 7075 Al-based composite was investigated. Experimental results exhibited fine grains, well-dispersed bimodal sized Al2O3 particles and well-bonded interface between Al2O3 particles and 7075Al matrix. The hardness and wear behavior of the bimodal sized Al2O3p/7075 composites were significantly enhanced, being compared to the 7075Al matrix and the single sized Al2O3p/7075 composites.
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