Volume 9, 2022
|Number of page(s)||12|
|Published online||07 February 2022|
Structural analysis, mechanical and damping behaviour of Al-Zn based composites reinforced with Cu and SiC particles
Materials Design and Structural Integrity Research Group, Department of Metallurgical and Materials Engineering, Federal University of Technology Akure, P.M.B. 704, Ondo State, Nigeria
2 Centre for Nanoengineering and Tribocorrosion, School of Mining, Metallurgy and Chemical Engineering, Faculty of Engineering & the Built Environment, University of Johannesburg, Johannesburg, South Africa
3 School of Chemical and Metallurgical Engineering and DSI-NRF Centre of Excellence in Strong Materials: all University of the Witwatersrand, Private Bag 3, WITS, 2050 Johannesburg, South Africa
4 African Academy of Sciences, P.O. Box 24916-00502, Nairobi, Kenya
* e-mail: email@example.com
Accepted: 15 January 2022
The structural characteristics, mechanical and damping properties of stir-cast Al-10 wt.% Zn based composites developed using 6 and 8 wt.% Cu, and 8 wt.% SiC particles as reinforcements, were investigated. The low porosity (<4%), near absence of dissolved Cu in the Al-Zn matrix, and marginal presence of melt reaction-induced intermetallic phases, attest to the soundness of the castings. Besides hardness, the strength parameters − ultimate tensile strength (149.33 MPa and 138.64 MPa) and specific strength (54.3 MPa cm3 g−1 and 51.16 MPa cm3 g−1) − of the Al-Zn composites reinforced with 6 and 8 wt.% Cu, were superior to that of the unreinforced Al-Zn alloy (103.47 MPa) and the 8 wt.% SiC reinforced composite (130.5 MPa). The fracture toughness (17.32 MPa m1/2 and 13.66 MPa m1/2) and percentage elongation (15% and 12.5%) of the 6 and 8 wt.% Cu reinforced Al-Zn composites, also surpassed that reinforced with SiC (KIC − 12.28 MPa m1/2; % εf − 9.5%). Improved matrix/particles interphase bonding and the inherent ductile and tough nature of Cu over SiC, were cited responsible for the improved strength-ductility-toughness balance of the Al-Zn/Cu composites over that reinforced with SiC. The damping properties were generally temperature sensitive, with all compositions exhibiting increase in damping capacity at test temperatures 100–200 °C.
Key words: Al-Zn/Cup composite / interface bonding / metallic reinforcement / mechanical properties / damping capacity / microstructure
© K.K. Alaneme et al., Published by EDP Sciences 2022
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