EFFECT OF FRICTION STIR PROCESSING (FSP) ON THE WEAR BEHAVIOR OF CAST AS21A MAGNESIUM ALLOY

Sumit Joshi, Ramesh Chandra Singh () and Rajiv Chaudhary ()
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Sumit Joshi: Department of Mechanical Engineering, Delhi Technological University, Bawana Road, New Delhi 110042, India
Ramesh Chandra Singh: Department of Mechanical Engineering, Delhi Technological University, Bawana Road, New Delhi 110042, India
Rajiv Chaudhary: Department of Mechanical Engineering, Delhi Technological University, Bawana Road, New Delhi 110042, India

Surface Review and Letters (SRL), 2021, vol. 28, issue 01, 1-12

Abstract: The contemporary trend of cost-saving is the primary motive while studying the relative motion between the material surfaces. Therefore, exceptional surface characteristics are the most desirable features for any material. The rapid emerging surface modification phenomena like Friction Stir Processing (FSP) have proved its potential in the surface engineering applications. In this study, Magnesium–Aluminum–Silicon (Mg–Al–Si)-based AS21A magnesium alloy was examined for the wear characterization in respect with the cast and Friction Stir Processed (FSPed) conditions. FSP, performed at an optimized set of parameters, was utilized to attain the surface modification in the investigated material. In the wear study, cast and FSPed conditions of AS21A specimens were examined on Pin-on-disc apparatus with typical load values ranging from 10–40N. The subsequent investigation involves characterization of worn surfaces through Scanning Electron Microscope (SEM) micrographs, and Energy Dispersive X-Ray Spectrometer (EDS) to understand the accountable wear mechanism. It was found that the FSPed AS21A samples exhibited noteworthy improvement in the wear characteristics at all assessment conditions. FSPed sample showed overall 17% enhancement in the specific wear rate. Also, with an increase in normal load, around 53–55% reduction was observed in the Coefficient of Friction (COF) value. It was established that the morphology of Mg2Si precipitates had an active contribution in the wear behavior of cast and FSPed AS21A samples. The notable mechanisms found responsible for the wear of samples were adhesion, abrasion, oxidation, delamination and plastic deformation.

Keywords: AS21A; magnesium alloy; friction stir processing; Mg2Si; wear testing; SEM; EDS (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X20500377

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