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Microstructural characteristics and mechanical behaviour of aluminium hybrid composites reinforced with groundnut shell ash and B4C

  • L. VenkateshEmail author
  • T. V. Arjunan
  • K. Ravikumar
Technical Paper
  • 49 Downloads

Abstract

In this study, aluminium hybrid composites were fabricated by reinforcing eco-friendly agrowaste, groundnut shell ash and boron carbide using squeeze casting method. Groundnut shell ash and boron carbide were added in ratios of 2.5:7.5, 5:5 and 7.5:2.5 percentages by weight. The impact on mechanical properties namely density, hardness, tensile strength, impact strength was studied, and the results were compared with the matrix alloy. The fracture mechanism of tensile and impact specimens were studied by scanning electron microscopy. Microstructural study reveals the uniform distribution and good bonding of reinforcements with clear interface in the hybrid composite. The hardness and tensile strength increased up to a maximum of 17% and 18.32%, respectively, and then slightly decreased while increasing groundnut shell ash particles. Increasing groundnut shell ash particles in hybrid composites decreases the impact strength and density to a maximum of 12% and 7.5%. Dimples, voids, cracks, clusters and particle fracture are characterised by fracture mechanism. Brittle fractures in the form of cracks, and particle fractures were formed due to the solid interfacial bonding between the reinforcements and alloy. Ductile fractures are the reason for high impact strength and are characterised by dimples and voids. The eco-friendly groundnut shell ash has the potential to serve as reinforcement for the development of composites.

Keywords

Hybrid composite Squeeze casting Groundnut shell ash Boron carbide Mechanical properties Microstructure 

Notes

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringCoimbatore Institute of Engineering and TechnologyCoimbatoreIndia
  2. 2.Department of Mechanical EngineeringDr.N.G.P Institute of TechnologyCoimbatoreIndia

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