Tribological Behavior of Al CoCrFeNi(Ti_0.5) High Entropy Alloys under Oil and MACs Lubrication

Yuan Yu¹，Jun Wang¹，Jinshan Li¹，Jun Yang²，Hongchao Kou¹，Weimin Liu²

1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences

摘 要：The tribological properties of AlCoCrFeNi and AlCoCrFeNiTi_0.5 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 AlCoCrFeNiTi_0.5 alloy keeps dendrite structure.Under the gear oil with good lubrication action,AlCoCrFeNiTi_0.5 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 AlCoCrFeNiTi_0.5 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 AlCoCrFeNiTi_0.5 alloy.Compared with AlCoCrFeNi alloy,AlCoCrFeNiTi_0.5 alloy keeps better wear-resistance at low applied load of 100 N,but preserves less wearresistance at high applied load of 200 N.

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