Hot deformation behaviour of bamboo leaf ash–silicon carbide hybrid reinforced aluminium based composite

Abstract

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.

Mechanical Properties of Sustainable Metal Matrix Composites: A Review on the Role of Green Reinforcements and Processing Methods

“…Ash produced during the incineration of bamboo leaf was also used as a reinforcing phase in Al based metal matrix composites. Alaneme et al [57][58][59] reported the composition of bamboo leaf ash as SiO 2 (76.4 wt%), Al 2 O 3 (5.04 wt%), MgO (2.05 wt%), K 2 O (5.76 wt%), CaO (6.68 wt%) and Fe 2 O 3 . In these studies, bamboo leaf ash (<50 µm) particles was used together with either Al 2 O 3 (28 µm) or SiC (30 µm) particles to prepare hybrid composites by two-step stir casting.…”

“…In these studies, bamboo leaf ash (<50 µm) particles was used together with either Al 2 O 3 (28 µm) or SiC (30 µm) particles to prepare hybrid composites by two-step stir casting. While superior fracture toughness was obtained for all the hybrid composite formulations, the increasing bamboo leaf ash content caused an insignificant drop in hardness and tensile strength [57,58]. Under tribological test conditions, the hybrid composites showed wear rates comparable to those reinforced with only SiC or Al 2 O 3 particles.…”

Enhanced mechanical behaviour and grain characteristics of aluminium matrix composites by cold rolling and reinforcement addition (Rice husk ash and Coal fly ash)

“…Many researchers have worked on the addition of agro-wastes which include coconut shell ash, fly ash, RHA, palm kernel ash and snail shell. 16–21 They have used reinforcing materials to improve the engineering properties of aluminium composites.…”