Fabrication characteristics and mechanical behaviour of rice husk ash – Alumina reinforced Al-Mg-Si alloy matrix hybrid composites

By K. K. Alaneme, I. B. Akintunde, Peter A. Olubambi, T. Adewale. 2013

228 citations recorded by the source corpus.

The fabrication characteristics and mechanical behaviour of Al-Mg-Si alloy matrix composites reinforced with alumina (Al2O3) and rice husk ash (RHA, an agro-waste) was investigated. This was aimed at assessing the viability of developing high performance Al matrix composites at reduced cost. Al2O3 particulates added with 0, 2, 3, and 4 wt% RHA were utilized to prepare 10 wt% of the reinforcing phase with Al-Mg-Si alloy as matrix using two-step stir casting method. Density measurement, estimated percent porosity, tensile testing, micro-hardness measurement, optical microscopy, and SEM examination were used to characterize the composites produced. The results show that the less dense Al-Mg-Si/RHA/Al2O3 hybrid composites have estimated percent porosity levels as low as the single Al2O3 reinforced grade (< 2.3% porosity). The hardness of the hybrid composites decreases slightly with increase in RHA content with a maximum reduction of less than 11% observed for the Al-4 wt% RHA-6wt% Al2O3 composition (in comparison with the Al-10 wt% Al2O3 single reinforced composition). Tensile strength reductions of 8% and 13%, and specific strengths which were 3.56% and 7.7% lower were respectively observed for the 3 wt% and 4 wt% RHA containing hybrid composites. The specific strength, percent elongation and fracture toughness of the 2 wt% RHA containing hybrid composite was however, higher than that of the single Al2O3 reinforced and other hybrid composite compositions worked on. RHA thus has great promise to serve as a complementing reinforcement for the development of low cost-high performance aluminum hybrid composites.

Subfields: Ceramics and Composites, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/36ba8662c15863321d0dd1ccb5cb41f1f5dfdc85

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Citations in the corpus

A Review on Mechanical and Tribological Behaviors of Stir Cast Aluminum Matrix Composites. (2014, background): “Alaneme et al. (2013) incorporated rice husk ash (RHA) and alumina particles into Al-Mg-Si alloy matrix and studied its corrosion and wear behaviour.”
Investigations on mechanical properties of aluminum hybrid composites (2014, background): “[9] studied the characterization and mechanical behavior of RHA reinforced hybrid composites and concluded that RHA has great promise to serve as a complementing reinforcement for the development of low cost products.”
Aluminium matrix hybrid composites: a review of reinforcement philosophies; mechanical, corrosion and tribological characteristics (2015, background): “However, they possess inferior properties when compared to the DRAMCs developed using conventional synthetic reinforcements [19,20].”
Characterization of hybrid aluminum matrix composites for advanced applications – A review (2016, background): “The silica has lower hardness level as compared to ceramics reinforcements [26,37].”
Corrosion and wear behaviour of Al-Mg-Si alloy matrix hybrid composites reinforced with rice husk ash and silicon carbide (2014, unknown): “The rice husk ash (with mesh size under 50 m and chemical composition as presented in Table 2) was prepared from complete burning of the rice husks, thermal processing, and sieving following procedures in accordance with Alaneme [10].”
Microstructure, mechanical and fracture properties of groundnut shell ash and silicon carbide dispersion strengthened aluminium matrix composites (2016, background): “Similar trend of invariance of percentage elongation to increase in weight ratio of other agro waste derivative hybrid reinforced aluminium composites has been reported (Alaneme et al., 2013a; Alaneme and Adewale, 2013).”