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      • KCI등재

        Preform-Based Production of Al2O3-Reinforced Aluminium Matrix Composites by Using Various Modification Techniques

        Kubilay Ozturk,Ridvan Gecu,Ahmet Karaaslan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5

        Metal matrix composites have a wide range of applications due to their lightweight, high strength and high wear resistance.In this study, Al2O3-reinforced AA7075 matrix composites were produced by using liquid metal infiltration method in twostages. In the first stage of the production, preforms were manufactured by using Al2O3particles and different binders. Someof the preforms were sintered and some were not sintered. In the second step, liquid metal infiltration was performed on bothsintered and not sintered samples. Some preforms were preheated before the infiltration and some were directly subjected tothe liquid metal infiltration. The casting process was carried out in two different ways: (1) pouring the molten metal into thefired mould and (2) in situ melting of the metal during the mould firing. Fabricated composites were characterized by XRD,light metal microscopy, SEM, EDS, Brinell hardness and ball-on-disc type wear tests. When the microstructural, mechanicaland tribological properties were taken into account, preheating and sintering preforms before casting were determinedas performing best with the hardness of ~ 150 HB and the wear rate of 1.1 × 10−4 mm3/(N m), whereas the in situ meltingcaused decrease in the mechanical strength and wear resistance because of excessive oxidation.

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