Study of the microstructure, hardness and tribological behavior of hypoeutectic Al-7Si hybrid composites

Purpose – This paper aims to investigate the microstructure, hardness and tribological properties of hypoeutectic (Al-7Si) matrix reinforced with fixed quantities of 3 Wt.% graphite (Gr) and x Wt.% SiCp (x = 3, 6 and 9) hybrid composites. Design/methodology/approach – The composites were fabricated...

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Bibliographic Details
Published in:Industrial lubrication and tribology 2016-03, Vol.68 (2), p.233-241
Main Authors: Viswanatha, BM, Prasanna Kumar, M, Basavarajappa, S, Kiran, TS
Format: Article
Language:English
Subjects:
Aluminum
Aluminum alloys
Aluminum base alloys
Carbides
Composite materials
Engineering
Graphite
Hardness
Hybrid composites
Investigations
Load
Mechanical engineering
Microstructure
Particle size
Particulate composites
Scanning electron microscopy
Silicon carbide
Solid lubricants
Tribology
Velocity
Wear rate
Wear resistance
Wear tests
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Summary:Purpose – This paper aims to investigate the microstructure, hardness and tribological properties of hypoeutectic (Al-7Si) matrix reinforced with fixed quantities of 3 Wt.% graphite (Gr) and x Wt.% SiCp (x = 3, 6 and 9) hybrid composites. Design/methodology/approach – The composites were fabricated by stir cast technique. The microstructure, hardness and tribological measurements were carried out on the base alloy and composites. The tribological investigation was carried out on pin-on-disc wear testing machine under dry sliding condition. Findings – The wear rate decreases with the increase of SiCp into A356-3Gr composites. The composite containing A356-9SiCp-3Gr had better hardness and good wear resistance compared to the base alloy. Scanning electron microscope (SEM) and electro dispersive spectrometry (EDS) images were used to study the reinforcement distribution and worn-out surface of the specimens. Originality/value – The present paper brings out a clear picture of the various events that take place under the worn-out surfaces leading to the generation of mechanical mixed layer.
ISSN:0036-8792
1758-5775
DOI:10.1108/ILT-06-2015-0080