Microstructure, microhardness, and tensile properties of hot-rolled Al6061/TiB2/CeO2 hybrid composites
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
South African Institute of Mining and Metallurgy
Abstract
TiB<inf>2</inf> and CeO<inf>2</inf> particle-reinforced Al6061 hybrid composites were manufactured using stir casting and hot rolling techniques. The base alloy and composites were hot-rolled at 500ºC and a 50% reduction was achieved through 12 passes. The effect of varying TiB<inf>2</inf> and CeO<inf>2</inf> particle additions on the microstructure and mechanical properties of the Al6061 matrix was studied. Scanning electron microscopy showed uniform dispersion of both the reinforcements, with good interfacial bonding. Microhardness and tensile properties like yield and tensile strength were found to be higher for hybrid composite with 2.5% TiB<inf>2</inf> and 2.5% CeO<inf>2</inf> compared to Al6061 alloy and other hybrid composites. The increased tensile strength is attributed to good dispersion and interfacial bonding between the particles and Al6061 matrix. Fracture analysis using a scanning electron microscope revealed ductile fracture for the Al6061 alloy and mixed characteristics of ductile-brittle fracture for hybrid composites. © 2021 South African Institute of Mining and Metallurgy. All rights reserved.
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Keywords
Cerium oxide, Dispersions, Hot rolling, Hybrid composites, Microhardness, Particle reinforced composites, Reinforcement, Scanning electron microscopy, Tensile strength, Aluminium matrix composites, Base alloys, Casting and hot rolling, Fracture analysis, Hot-rolled, Interfacial bonding, matrix, Particle reinforced, Stir casting, Microstructure
Citation
Journal of the Southern African Institute of Mining and Metallurgy, 2021, , 121, pp. 543-548