Abstract: AlCoCrCuFeNi_x(x=0.5,1) high-entropy alloy coating was prepared by cold spray-assisted in situ synthesis method, and the microstructure structure and friction and wear performance of the coating were characterized and tested. Then, the friction process of AlCo and FeCr phases in high entropy alloy coating was simulated by molecular dynamics method, and the influence of AlCo and FeCr phases on the friction properties of high entropy alloy coating was simulated and analyzed. The results showed that under the same friction conditions, the friction force exerted by the AlCo phase is greater than that exerted by the FeCr phase, and the wear of the AlCo phase is greater than that of the FeCr phase. The AlCo phase produces adhesion and desorption atoms during friction, resulting in an increase in the total friction force, while during the FeCr phase friction, no obvious adhesion atoms are found. An obvious dislocation structure is produced inside the AlCo phase, the total length of the dislocation continues to increase with the increase of the friction distance, and two mixed dislocation structures are produced in the final stage of friction, but no dislocation structure is found inside the FeCr phase. This shows that the FeCr has a greater contribution to the wear resistance of the AlCoCrCuFeNi high-entropy alloy coating.

Key words: high entropy alloy coating, molecular dynamics, FeCr phase, AlCo phase