固体润滑国家重点实验室（LSL）知识库

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 wear-resistance at high applied load of 200 N.