火焰喷涂高熵合金增强铜基复合涂层的组织和耐磨性研究

Study on the Microstructure and Wear Resistance of Flame Sprayed High Entropy Alloy Reinforced Copper-Based Composite Coatings

为了研究AlCoCrFeNi高熵合金(HEA)的加入对铜基复合涂层形貌、显微硬度和耐磨性的影响,以火焰喷涂法在40Cr钢表面制备了AlCoCrFeNi/Cu复合涂层,并采用X射线衍射仪、显微硬度计、扫描电镜和高速摩擦磨损试验机等对涂层的组织及耐磨性进行了测试表征。结果表明:高熵合金(HEA)由BCC和FCC双相固溶体组成。AlCoCrFeNi/Cu复合涂层呈层状结构。随着高熵合金含量的增加,复合涂层的显微硬度增加,当AlCoCrFeNi高熵合金达到最大加入量40%时,显微硬度达到最高值490.8 HV,磨损量达到最低值1.06 mg,比未添加高熵合金时降低94.9%,摩擦系数随高熵合金含量的增加而逐渐增大。

In order to study the effect of AlCoCrFeNi high entropy alloy(HEA)on the morphology,microhardness and wear resistance of copper-based composite coatings,the AlCoCrFeNi/Cu composite coatings were prepared on the surface of 40 Cr steel by flame spraying.The microstructure and wear resistance of coatings were analyzed by X-ray diffraction,microhardness tester,scanning electron microscope and high-speed friction wear testing machine.Results showed that the phase structure of high entropy alloy(HEA)was composed of BCC and FCC two-phase solid solution,and the morphology of AlCoCrFeNi/Cu composite coating was lamellar.With the increase of the content of high entropy alloy,the microhardness of the composite coating increased.When AlCoCrFeNi high entropy alloy reached the maximum of 40%,the microhardness of the composite coating increased to the maximum of 490.8 HV,and the wear rate decreased to the minimum of 1.06 mg,which was 94.9%lower than that without high entropy alloy(HEA)addition.Besides,the friction coefficient increased with the increase of high entropy alloy content.