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High-temperature wear mechanisms of a severely plastic deformed Al/Mg2Si composite

[+] Author and Article Information
Mahsa Ebrahimi

The Complex Laboratory of Hot Deformation & Thermomechanical Processing of High Performance Engineering Materials, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran
Mahsa.ebrahimi@ut.ac.ir

Abbas Zarei-Hanzaki

The Complex Laboratory of Hot Deformation & Thermomechanical Processing of High Performance Engineering Materials, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran
zareih@ut.ac.ir

Amirhossein Shafieizad

The Complex Laboratory of Hot Deformation & Thermomechanical Processing of High Performance Engineering Materials, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran
a.shafieizad@ut.ac.ir

Michaela Šlapáková

Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
slapakova@karlov.mff.cuni.cz

Parya Teymoori

The Complex Laboratory of Hot Deformation & Thermomechanical Processing of High Performance Engineering Materials, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran
parya_teymoory@ut.ac.ir

1Corresponding author.

ASME doi:10.1115/1.4041764 History: Received June 22, 2018; Revised October 04, 2018

Abstract

The present work was primarily conducted to study the wear behavior of as-received and severely deformed Al-15%Mg2Si in-situ composites. The severe plastic deformation was applied using accumulative back extrusion (ABE) technique (one and three passes). The continuous dynamic recrystallization (CDRX) was recognized as the main strain accommodation and grain refinement mechanism within aluminum matrix during ABE cycles. To investigate the wear properties of the processed material, the dry sliding wear tests were carried out on both the as-received and processed samples under normal load of 10 and 20 N at room temperature, 100 and 200 ?. The results indicated a better wear resistance of processed specimens in comparison to the as-received ones at room temperature. In addition, the wear performance was improved as the ABE pass numbers increased. These were related to the presence of oxide tribo-layer. At 100 ?, the as-received material exhibited a better wear performance comparing to the processed material; this was attributed to the formation of a work-hardened layer on the worn surface. At 200 ?, both the as-received and processed composites experienced a severe wear condition. In general, elevating the temperature changed the dominant wear mechanism from oxidation and delamination at room temperature to severe adhesion and plastic deformation at 200 ?.

Copyright (c) 2018 by ASME
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