Effect of Nano-Al₂O₃ on Characteristics of Aluminium A356 Matrix Composite Produced by Stir Casting Route

Abstract:

Aluminium Matrix Composites (AMCs) made by A356 as matrix and nanoAl₂O₃ as reinforced are widely used for high performance application because of light weight and alumina has good performance at high temperature. In this study, the nanoAl₂O₃ used varied from 0.1 vf-% to 1.2 vf-%, which subsequently determined the optimum point. In addition, the magnesium with 10% are added as a wetting agent between aluminium and nanoAl₂O₃ as reinforced. Stir casting process is carried out for 2 minutes and 4 minutes for the degassing process using argon gasses then pouring molten metal in to the mold at 800°C. The effect of nanoAl₂O₃ on the mechanical properties and microstructure of the composites was investigated. The result showed that the tensile strength decreased with the addition of nanoAl₂O₃ but the hardness increased. Increasing of hardness mainly caused by grain refinement, and particle strengthening which act as obstacles to the motion of dislocations. Addition of nanoAl₂O₃ as reinforced also tend to form microporosity and agglomeration which would decrease the tensile strength of composites. The optimum strength was reached by 0.5 %Vf nanoAl₂O₃ with the value of 140 MPa and hardness of 46 BHN which was supported by low porosity level. Keyword : Al A356, Al₂O₃, nanoComposite, Stir Casting

• Periodical: Materials Science Forum (Volume 1000)
• Pages: 160-166
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1000.160
• Online since: July 2020
• Authors: Nabila Akmalita Khairul Islam, Nayona Ega Wicaksana, Anne Zulfia Syahrial*
• Keywords: Al A356, Al₂O₃, Nanocomposite, Stir Casting

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