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Tribological Characterisation of Hypereutectic Al-25Si Alloy under Dry and Lubricated Sliding Conditions

[+] Author and Article Information
Parveen Kumar

Tribology Laboratory, Department of Mechanical Engineering, National Institute of Technology, Srinagar, Jammu & Kashmir, India
parveen_35phd15@nitsri.net

Mohd Farooq Wani

Tribology Laboratory, Department of Mechanical Engineering, National Institute of Technology, Srinagar, Jammu & Kashmir, India
mfwani@nitsri.net

1Corresponding author.

ASME doi:10.1115/1.4036918 History: Received January 11, 2017; Revised May 03, 2017

Abstract

Friction and wear properties of hypereutectic Al-25Si alloy were studied under dry and lubricated sliding conditions. Hypereutectic Al-25Si alloy were prepared by rapid solidification process under T6 condition. Experimental studies were conducted using ball on disc type tribometer. The effect of sliding distance and normal load on the friction and wear were investigated. COF remained stable with increase in sliding distance (250-1500 m) and decrease with increase in normal load (10-50 N), whereas, wear rate decreased with increase in sliding distance and increased with the increase in normal load upto 40 N and then attained a steady state value under dry and lubricated sliding conditions. The improvements in COF and wear rate were mainly attributed to morphology, size and distribution of hypereutectic Si particles due to its fabrication process. Scanning electron microscopy (SEM), Energy Dispersive Spectroscopy (EDS), optical microscopy and 3D - surface profilometer were used for characterization of wear tracks. The dominant wear mechanism for hypereutectic Al-25Si alloy was adhesive wear, abrasive wear and plastic deformation.

Copyright (c) 2017 by ASME
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