Volume 7, 2020
|Number of page(s)||14|
|Published online||09 June 2020|
Hot deformation behaviour of bamboo leaf ash–silicon carbide hybrid reinforced aluminium based composite
Materials Design and Structural Integrity Research Group, Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure, PMB 704, Nigeria
2 School of Chemical and Metallurgical Engineering, African Materials Science and Engineering Network (AMSEN) and DST-NRF Centre of Excellence in Strong Materials; all University of the Witwatersrand, Private Bag 3, WITS, 2050 Johannesburg, South Africa
3 The African Academy of Sciences (AAS), P.O. Box 24916-00502, Nairobi, Kenya
* e-mail: email@example.com
Accepted: 21 April 2020
Isothermal compression testing of BLA-SIC hybrid reinforced Aluminium composites was performed on Gleeble 3500 thermomechanical simulator under different deformation temperatures (300–400 °C) and strain rates (0.01–1 s‑1). The flow behaviour and the softening mechanisms were established using the trend of the stress-strain curves, activation energy and microstructural examination. The results showed that flow stress increased with decreasing temperature; but was not entirely strain rate sensitive − a characteristic identified in some Al 6XXX based metallic systems. Also, uncharacteristic flow stress oscillations were observed at strain rates of 0.01 and 0.1 s‑1 while steady state flow stress was observed at 1 s‑1. The hot working activation energy was ∼290.5 kJ/mol which was intermediate to the range of 111–509 kJ/mol reported in literature for various Al based composites. It was proposed that at strain rates of 0.01 and 0.1 s‑1, dynamic recrystallization and/or dislocations-reinforcements interactions were the dominant deformation mechanism(s), while at 1 s‑1, dynamic recovery was predominant.
Key words: Al6063/BLA-SiC composite / hot deformation / flow stress / softening mechanism / microstructure / compression testing / constitutive equation
© K.K. Alaneme et al., Published by EDP Sciences 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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