Abstract

IYENGAR, S.; SETHURAM, D.; SHOBHA, R.  and  KOPPAD, P.G.. Microstructure, microhardness, and tensile properties of hot-rolled Al6061/TiB₂/CeO₂ hybrid composites. J. S. Afr. Inst. Min. Metall. [online]. 2021, vol.121, n.10, pp.543-548. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/1560/2021.

T1B₂ and CeO₂ particle-reinforced A16061 hybrid composites were manufactured using stir casting and hot rolling techniques. The base alloy and composites were hot-rolled at 500°C and a 50% reduction was achieved through 12 passes. The effect of varying TB₂ and CeO₂ 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% TiB₂ and 2.5% CeO₂ 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.

Keywords : aluminium matrix composites; hot rolling; microstructure; mechanical properties; fracture analysis.

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