Friction And Wear Behavior Of Single-Phase High-Entropy Alloyfeconicrmn Under Mos2-Oil Lubrication

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. L-25(5(6)) orthogonal wear tests were designed for velocity V-rel (4.167-20.833 mm/s), load F-N (10-50 N), temperature T (RT-140 degrees 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 V-rel, F-N and T. Energy dispersive spectrometer and scanning electron microscope were applied to characterize the surface morphology of wear scar and its element distribution. Findings V-rel, F-N and t exerted the most significant influence (p < 0.01) on the average friction coefficient f. V-rel and F-N were identified as the momentous effect (p < 0.01) on wear volume Delta V. T (>= 50 degrees C) had positive correlation with f and Delta V, and both V-rel and F-N 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 (V-rel >= 12.5 mm/s) and loading levels (F-N >= 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: http://dx.doi.org/10.1108/ILT-08-2019-0303.