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Paper | Open Access

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

Xiao Yang1, Qunli Zhang1, Yang Zheng1, Xiaochuan Liu3, Denis Politis2, Omer El Fakir1, Liliang Wang1( )
Department of Mechanical Engineering, Imperial College London, SW7 2AZ London, United Kingdom
Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678 Nicosia, Cyprus
School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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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.

Keywords

elevated temperaturesfriction evolutionlubricant breakdown behaviourpin-on-disc test

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International Journal of Extreme Manufacturing
Volume 3 Issue 2,
June 2021
Pages 025002-025002
DOI: 10.1088/2631-7990/abe847
Cite this article:
Yang X, Zhang Q, Zheng Y, et al. Investigation of the friction coefficient evolution and lubricant breakdown behaviour of AA7075 aluminium alloy forming processes at elevated temperatures. International Journal of Extreme Manufacturing, 2021, 3(2): 025002. https://doi.org/10.1088/2631-7990/abe847

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Received: 21 May 2020
Revised: 07 July 2020
Accepted: 18 February 2021
Published: 03 March 2021
© 2021 The Author(s).

Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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