INVESTIGATION ON MECHANICAL AND WEAR PROPERTIES OF ZINC-COATED STEEL WIRES REINFORCED LM6 ALUMINIUM ALLOY COMPOSITES BY SQUEEZE CASTING

Samson Jerold Samuel Chelladurai and Ramesh Arthanari
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Samson Jerold Samuel Chelladurai: Department of Mechanical Engineering, Sri Krishna College of Engineering and Technology, Coimbatore 641008, India
Ramesh Arthanari: #x2020;Department of Mechanical Engineering, Sri Krishna College of Technology, Coimbatore 641042, India

Surface Review and Letters (SRL), 2019, vol. 26, issue 01, 1-10

Abstract: Zinc-coated steel wires (1–5 numbers) reinforced in LM6 matrix composites have been prepared by squeeze casting process. Microstructure, hardness, tensile strength, ductility and dry sliding wear behavior of composites have been investigated by varying sliding distance and load. Fracture surface of tensile specimens and worn out surface of wear samples have been examined using field emission scanning electron microscope (FESEM). The results reveal that hardness of composites increased with increasing distance from matrix to steel wires. Maximum hardness values of 751 VHN and 611 VHN are observed in steel wire and at the interface of steel wire — aluminium, respectively. Tensile strength of composites increased upto 24% by reinforcing three steel wires in matrix. During the wear test, weight loss, wear rate and coefficient of friction decreased with increasing number of wires embedded in matrix and increased with increasing sliding distance and load. LM6 aluminium alloy reinforced with five numbers of steel wires decreased the weight loss upto 17% as compared to matrix under 40N load and a sliding distance of 2000m. Fracture surface of tensile specimen shows dimple formation in matrix and broken wires are observed in composites. Worn surface of composites shows fine grooves, whereas delamination is observed in matrix. In general, reinforcement of zinc-coated steel wires in LM6 aluminium alloy exhibited better mechanical properties and wear resistance compared to matrix.

Keywords: Aluminium alloy; squeeze casting; steel wires; microstructure; mechanical properties; wear (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X18501251

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