The Characteristics of Alumina Particle Reinforced Pure Al Matrix Composite
N. Parvina and M. Rahimianb
aFaculty of Mining and Materials Engineering, Amirkabir University of Technology (AUT), Hafez Ave., Tehran, Iran
bFaculty of Engineering, Islamic Azad University - Semnan Branch, Damghan Rd. km 5, Semnan, Iran
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Al2O3 is widely used as the reinforcing additive in the metal matrix composites. The influence of Al2O3 particle size on the density, hardness, microstructure, yield stress, compression strength, and elongation of the sintered Al-Al2O3 composites were investigated. In the present study, 10 wt% of Al2O3 powder with three different particle sizes (3, 12 and 48 μm) were used in the production of the samples. Powder metallurgy technique was utilized to obtain more homogeneous Al2O3 distribution across the composites. The samples were cold pressed at 440 MPa, and sintered at 550°C for 45 min. Results showed that the relative density of the composite was initially increased with decreasing particle size. However, it was decreased with further particle size reduction. It was also pointed out that the mechanical properties of the specimens were increased with decreasing particle size. The grain size and particle distribution homogeneity was decreased with raising the particle size.
DOI: 10.12693/APhysPolA.121.108
PACS numbers: 81.05.Ni