Effect of micro graphite particles on the microstructure and mechanical behavior of aluminium 6061 (Al-Mg-Si) alloy composites developed by novel two step casting technique

Madeva NAGARAL; Raghavendra  Pai K; V  Auradi; Bharath  V; Shanawaz  Patil; Mahantesh S  Tattimani

doi:10.55713/jmmm.v31i2.1046

Authors

Madeva NAGARAL Deputy Manager, Aircraft Research and Design Centre, HAL, Bangalore-560037, Karnataka, India http://orcid.org/0000-0002-8248-7603
Raghavendra Pai K Department of Mechanical Engineering, NMAM Institute of Technology, Nitte-574110, Karnataka, India
V Auradi Department of Mechanical Engineering, Siddaganga Institute of Technology, Tumkur-572103, Karnataka, India
Bharath V Department of Mechanical Engineering, Siddaganga Institute of Technology, Tumkur-572103, Karnataka, India
Shanawaz Patil School of Mechanical Engineering, Reva University, Bangalore-560064, Karnataka, India
Mahantesh S Tattimani Department of Mechanical Engineering, SKSVM Agadi College of Engineering and Technology, Laxmeshwar-582116, Karnataka, India

DOI:

https://doi.org/10.55713/jmmm.v31i2.1046

Keywords:

Graphite Particles, Microstructure, Tensile Strength, Fractography

Abstract

In the present research, the effect of micron sized graphite addition on the microstructure and tensile failure of Al6061 alloy has been studied. The Al6061 alloy metal matrix composites reinforced with 6, 9 and 12 varying weight percentages of graphite particles were fabricated by novel two step stir cast route which helps in improving the wettability of Al6061 alloy matrix with graphite particles. The synthesized composites were subjected to microstructural studies, density, hardness and tensile properties testing. Microstructural characterizations of obtained samples were carried out by SEM microscopy, EDS and XRD patterns. The occurrence of graphite particles were confirmed by the XRD patterns. The density and hardness of metal composites have been decreased with adding of graphite reinforcement, while the ultimate tensile strength and yield strengths were improved with the addition of graphite particles. There was increase in the elongation of the Al6061 alloy composite after the incorporation of the reinforcement. Various fracture mechanisms were observed in the Al6061-graphite composites using SEM.

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