Investigation of Tribological Behavior of a Novel Hybrid Composite Prepared with Al-Coconut Shell Ash Mixed with Graphite

The present investigation develops a next-generation hybrid Al metal matrix composite using coconut shell ash (CSA) and graphite (Gr) reinforcement. Stir-casting is adapted to prepare an Al-1100-based composite. Three other composites of Al-Al 2 O 3 , Al-Al 2 O 3 -Gr, and Al-CSA are prepared that co...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2017-08, Vol.48 (8), p.3892-3903
Main Authors: Siva Sankara Raju, R., Panigrahi, M. K., Ganguly, R. I., Srinivasa Rao, G.
Format: Article
Language:English
Subjects:
Abrasion
Alloys
Aluminum oxide
Ashes
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composite materials
Graphite
Hardness
Iron
Manganese
Materials Science
Mechanical properties
Metallic Materials
Metallurgy
Nanotechnology
Reinforcement
Scanning electron microscopy
Spectroscopic analysis
Structural Materials
Surfaces and Interfaces
Tensile strength
Thin Films
Toughness
Tribology
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Summary:The present investigation develops a next-generation hybrid Al metal matrix composite using coconut shell ash (CSA) and graphite (Gr) reinforcement. Stir-casting is adapted to prepare an Al-1100-based composite. Three other composites of Al-Al 2 O 3 , Al-Al 2 O 3 -Gr, and Al-CSA are prepared that contain equivalent volume fractions of Al 2 O 3 , CSA, and Gr. These assist in comparisons among the three composites and the developed hybrid Al-CSA-Gr composite. The study reveals that the addition of 3 pct Gr improves the specific strength, toughness, and tribological properties. The Al-CSA composite shows better mechanical properties, such as tensile strength and hardness, than the other three composites. Gr addition helps the hybrid Al-CSA-Gr composite to attain better tribological properties with a slightly lower specific strength. Scanning electron microscopy studies of the worn material surfaces corroborate the findings of the abrasion testing. Elemental analyses by energy-dispersive X-ray spectroscopy of the debris from the counter-face of the tribo surface confirm the presence of Al, O, Si, Fe, Mn, and C.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-017-4139-1