Fabrication and Studying the Mechanical Properties of A356 Alloy Reinforced with Al<sub>2</sub>O<sub>3</sub>-10% Vol. ZrO<sub>2</sub> Nano-particles through Stir Casting

Abstract

Al 2 O 3-ZrO 2 with a high level of hardness and toughness is known as ceramic steel. Due to its unique properties it can be used as a reinforcement in fabrication of metal matrix composites. In this study, nanoparticles of Al 2 O 3-10% ZrO 2 with an average size of 80 nm were used to fabricate Al matrix composites containing 0.5, 1, 1.5 and 2 wt.% of the reinforcement. The fabrication route was stir casting at 850˚C. There is no report about usage of this reinforcement in fabrication of composites in the literature. The microstructures of the as-cast composites were studied by scanning electron microscope (SEM). Density measurement, hardness and tensile properties were carried out to identify the mechanical properties of the composites. The results revealed that with increasing the reinforcement content, density decreased while yield, ultimate tensile strength and compressive strength increased. Also, hardness increased by increasing the reinforcement content up to 1 wt.% Al 2 O 3-10% ZrO 2 but it decreased in the samples containing higher amounts of reinforcement.

Mechanical Properties of Al 6061/Al2O3 Nanocomposite by Stir Casting

“…b) The thermal mismatch between the metal matrix and the reinforcement is the major mechanism for increasing the dislocation density of the matrix and therefore increasing the composite strength (ultimate and yield strengths. Also, the less porosity and uniform distribution of Al2O3 into the matrix leads to enhance the mechanical properties of composites [11].…”

“…This enhancement in the corrosion resistance was attributed to the heat treatment of hybrid composites, which resulted in the formation of a protective surface layer, which gradually develops and subsequently reaches a steady state with time [10]. Hajizamani and Baharvandi [11], studied the mechanical behavior of aluminium alloy (Al 356) reinforced with Al2O3-10% ZrO2 nanoparticles. This alloy fabricated by stirring casting at 850°C.…”

“…The high amount of porosity is extremely reliant on the air bubbles that might be entering the melts reinforcing particles either independently or as an air envelope. Accordingly, the porosity should be remained at the lowest level, as this kind of a composite defect [11].…”

Improvement of Mechanical and Fatigue Properties for Aluminum Alloy 7049 By Using Nano Composites Technique

“…Hajizamani and Baharvandi [14] Used hybrid Nano composites with A356 aluminum alloy base metal taking four weight percentages 0.5, 1, 1.5 and 2w ‫%ݐ‬ of Al2O3 and 10% volume of ZrO2. The Stir casting technique was used for manufacturing the Nano composites.…”

Production and Microstructure Characterization of Aa6061 Matrix Activated Carbon Particulate Reinforced Composite by Friction Stir Casting Method

“…11 As per literature review, the Activated carbon surface area is in excess of 500m. 2,12,13 The density of activated carbon is 2100kg/m 3 .Compare to available reinforcement added with AA6061 activated carbon have some distinct advantages like readily available, cheap and good adsorption. 14,15 In the present work, an attempt has been made to fabricate AA6061/activated carbon hybrid composite.…”