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Friction and wear behavior of single-phase high-entropy alloy FeCoNiCrMn under MoS2-oil lubrication

Hao Wang (School of Mechanical Engineering, Southeast University, Nanjing, China)
Kai Ren (School of Mechanical Engineering, Southeast University, Nanjing, China)
Jin Xie (Rtec Instruments, San Jose, California, USA)
Chen Zhang (School of Mechanical Engineering, Southeast University, Nanjing, China)
Wencheng Tang (School of Mechanical Engineering, Southeast University, Nanjing, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 11 December 2019

Issue publication date: 16 June 2020

211

Abstract

Purpose

The face-centered cubic structured single-phase FeCoNiCrMn high-entropy alloys (HEAs) were prepared to study the friction and wear behavior of HEAs under MoS2-oil lubrication.

Design/methodology/approach

FeCoNiCrMn alloys were subjected to ball-on-disc reciprocating sliding against the GCr15 ball. L25(56) orthogonal wear tests were designed for velocity Vrel (4.167-20.833 mm/s), load FN (10-50 N), temperature T (RT-140 °C) and time t (5-20 min). Based on orthogonal test results, multivariate repeated measures ANOVA was performed, and further comparative experiments were conducted for Vrel, FN and T. Energy dispersive spectrometer and scanning electron microscope were applied to characterize the surface morphology of wear scar and its element distribution.

Findings

Vrel, FN and t exerted the most significant influence (p < 0.01) on the average friction coefficient f. Vrel and FN were identified as the momentous effect (p < 0.01) on wear volume ΔV. T (≥50 °C) had positive correlation with f and ΔV, and both Vrel and FN correlated negatively with f. The dominant abrasive wear was attributed to the large hardness difference of the friction pair. Fatigue wear and delamination wear were experienced at higher speeds (Vrel  ≥ 12.5 mm/s) and loading levels (FN ≥ 40 N). Elevated temperature weakens the lubrication effect of MoS2-oil and the mechanical properties of FeCoNiCrMn matrix, intensifying abrasive wear.

Originality/value

This study is expected to provide references for exploration on the wear behavior of single-phase HEAs under complex working conditions with lubrication and hence will help develop the application of HEAs in practical engineering.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2019-0303

Keywords

Acknowledgements

This study was sponsored by the National Natural Science Foundation of China (51675100) and the Scientific Research Innovation Project of Jiangsu 2019 (KYCX19_0064).

Citation

Wang, H., Ren, K., Xie, J., Zhang, C. and Tang, W. (2020), "Friction and wear behavior of single-phase high-entropy alloy FeCoNiCrMn under MoS2-oil lubrication", Industrial Lubrication and Tribology, Vol. 72 No. 5, pp. 665-672. https://doi.org/10.1108/ILT-08-2019-0303

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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