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Investigation of the friction coefficient evolution and lubricant breakdown behaviour of AA7075 aluminium alloy forming processes at elevated temperatures

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Title: Investigation of the friction coefficient evolution and lubricant breakdown behaviour of AA7075 aluminium alloy forming processes at elevated temperatures
Authors: Yang, X
Zhang, Q
Zheng, Y
Liu, X
Politis, DJ
Elfakir, O
Wang, L
Item Type: Journal Article
Abstract: The lubricant behaviour at elevated temperatures was investigated by conducting pin-on-disc tests between P20 tool steel and AA7075 aluminium alloy. The effects of temperature, initial lubricant volume, contact pressure and sliding speed on the lubricant behaviour (i.e. evolutions of the coefficient of friction (COF) and the breakdown phenomenon) were experimentally studied. The evolutions of COF at elevated temperatures consisted of three distinct stages with different friction mechanisms. The first stage (stage I) occurred with low friction when the boundary lubrication was present. The second stage (stage II) was the transition process in which the COF rapidly increased as the lubricant film thickness decreased to a critical value. In the final plateau stage (stage III), lubricant breakdown occurred and intimate contact at the interface led to high friction values. At the low friction stage (stage I), the value of COF increased with increasing temperature. The increase in temperature, contact pressure and sliding speed as well as the decrease in initial lubricant volume accelerated the lubricant breakdown.
Issue Date: 3-Mar-2021
Date of Acceptance: 18-Feb-2021
URI: http://hdl.handle.net/10044/1/87069
DOI: 10.1088/2631-7990/abe847
ISSN: 2631-8644
Publisher: IOP Publishing
Start Page: 1
End Page: 8
Journal / Book Title: International Journal of Extreme Manufacturing
Volume: 3
Issue: 2
Copyright Statement: © 2021 The Author(s). Published by IOP Publishing Ltd on behalf of the IMMT. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Sponsor/Funder: Heilongjiang Academy of Sciences Institute of Automation
Funder's Grant Number: Heilongjiang-Imperial-int manu
Publication Status: Published
Online Publication Date: 2021-03-03
Appears in Collections:Mechanical Engineering



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