FeCr相与AlCo相在AlCoCrCuFeNi高熵合金涂层摩擦过程中的作用分析

Analysis of the effect of FeCr phase and AlCo phase in the friction process of AlCoCrCuFeNi high entropy alloy coating

采用冷喷涂辅助原位合成方法制备AlCoCrCuFeNi_(x)(x=0.5,1)高熵合金涂层,对涂层微观组织结构和摩擦磨损性能进行表征和测试.然后采用分子动力学的方法模拟了高熵合金涂层中AlCo相和FeCr相的摩擦过程,模拟分析了高熵合金涂层中AlCo相和FeCr相对高熵合金摩擦性能的影响.结果表明:在相同的摩擦条件下,AlCo相所受到的摩擦力大于FeCr相所受到的摩擦力,AlCo相的磨损量要大于FeCr相的磨损量.AlCo相在摩擦过程中产生了粘附与脱附原子,导致总摩擦力上升,而在FeCr相摩擦过程中,没有发现明显的粘附原子.AlCo相内部产生了明显的位错结构,位错总长度随摩擦距离的增加持续增加,并且在摩擦的最终阶段产生了两种混合位错结构,但是在FeCr相的内部并没有发现位错结构.说明FeCr相对AlCoCrCuFeNi高熵合金涂层的耐磨性能有更大的贡献.

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.