Tribological Behavior of AlCoCrFeNi(Ti0.5) High Entropy Alloys under Oil and MACs Lubrication

doi:10.1016/j.jmst.2016.02.005

Abstract

Abstract:

The tribological properties of AlCoCrFeNi and AlCoCrFeNiTi0.5 high entropy alloys under gear oil and multiply alkylated cyclopentanes (MACs) lubrication condition have been studied. The equiaxed crystal structure of AlCoCrFeNi alloy is obtained after heat-treatment. The AlCoCrFeNiTi0.5 alloy keeps dendrite structure. Under the gear oil with good lubrication action, AlCoCrFeNiTi0.5 alloy preserves better tribological properties than AlCoCrFeNi alloy. The delamination and crack behaviors tend to occur in the grain boundary of AlCoCrFeNi alloy and along the interdendrite region of AlCoCrFeNiTi0.5 alloy. Under the MACs with relatively poor lubrication action, the applied load slightly influences the wear behavior of AlCoCrFeNi alloy, but seriously impacts the wear mechanism of AlCoCrFeNiTi0.5 alloy. Compared with AlCoCrFeNi alloy, AlCoCrFeNiTi0.5 alloy keeps better wear-resistance at low applied load of 100 N, but preserves less wear-resistance at high applied load of 200 N.

Key words: High entropy alloy, Oil lubrication, Tribological properties, Microstructure, Delamination

Yuan Yu, Jun Wang, Jinshan Li, Jun Yang, Hongchao Kou, Weimin Liu. Tribological Behavior of AlCoCrFeNi(Ti0.5) High Entropy Alloys under Oil and MACs Lubrication[J]. J. Mater. Sci. Technol., 2016, 32(5): 470-476.

Figures/Tables 10

XRD patterns of the AlCoCrFeNi and AlCoCrFeNiTi0.5 alloys.

Backscattered electron images of the AlCoCrFeNi and AlCoCrFeNiTi0.5 alloys.

Variations of COF for the AlCoCrFeNi alloy (a) and AlCoCrFeNiTi0.5 alloy (b) with the sliding speed and applied load under gear oil.

Variations of wear rate for the AlCoCrFeNi alloy (a) and AlCoCrFeNiTi0.5 alloy (b) with the sliding speed and applied load under gear oil.

SEM and BSE micrographs of the worn surface of AlCoCrFeNi alloy at the sliding speed of 0.06 m/s under gear oil: (a) SE of 100 N, (b) SE of 200 N, (c) BSE of 200 N.

SEM and BSE micrographs of the worn surface of AlCoCrFeNiTi0.5 alloy at the sliding speed of 0.06 m/s under gear oil: (a) SE of 100 N, (b) SE of 200 N, (c) BSE of 200 N.

Variations of COF for the AlCoCrFeNi alloy (a) and AlCoCrFeNiTi0.5 alloy (b) with the sliding speed and applied load under MACs oil.

Variations of wear rate for the AlCoCrFeNi alloy (a) and AlCoCrFeNiTi0.5 alloy (b) with the sliding speed and applied load under MACs oil.

SEM micrographs of the AlCoCrFeNi alloy at different sliding speeds and applied loads under MACs oil: (a) 100 N, 0.04 m/s

(b) 100 N, 0.06 m/s

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