AlCoCrFeNiV高熵合金涂层制备及力学性能

Preparation and mechanical properties of AlCoCrFeNiV high entropy alloy coatings

为了加强机械零部件的表面耐磨防护,采用等离子喷涂后激光重熔方法在Q235钢基体上制备了不同V含量的AlCoCrFeNiV_(X)高熵合金涂层,测试了涂层的硬度和耐磨性.结果表明:合金涂层呈现出典型的枝晶和枝晶间组织,且在枝晶间组织附近出现了条状CrV相;V含量较低时,合金涂层为FCC+BCC双相结构;随着V含量的增加,合金涂层转变为单相BCC结构;在V含量升高的同时,合金涂层的硬度和耐磨性都随之提高;当V摩尔值为1.0时,涂层平均硬度达到了627.43 HV,此时涂层磨损失重最小,磨损机制表现为磨料磨损以及轻微氧化磨损.

In order to improve the surface wear resistance of mechanical parts,AlCoCrFeNiV_(X) high entropy alloy coatings with different vanadium contents were prepared on Q235 steel subtrate by a laser remelting method after plasma spraying,and the hardness and wear resistance of coatings were tested.The results show that the alloy coatings present typical dendritic and interdendritic structures,and strip-shaped CrV phases appear near the interdendritic structures.When the vanadium content is low,the alloy coating presents a dual-phase FCC+BCC structure.As the vanadium content increases,the alloy coatings change to a single-phase BCC structure.The hardness and wear resistance of alloy coatings get improved with the increase of vanadium content.When the mole value of vanadium reaches 1.0,the average hardness of coating is 627.43 HV.At this state,the coating wear loss is the smallest,and the wear mechanism demontrates abrasive wear and slight oxidation wear.