Al含量对FeCrNiCoCu高熵合金涂层组织结构及冲蚀性能的影响

采用放电等离子烧结(SPS)制备不同Al含量的Al_xFeCrNiCoCu(x=0,1,2,3)高熵合金涂层.通过XRD、SEM和冲蚀磨损等检测方法,研究了Al含量对该高熵合金涂层的组织及冲蚀磨损性能的影响.结果表明:FeCrNiCoCu高熵合金的微观组织主要为简单FCC结构的富Cu相及富Al相.随着Al元素增加,涂层的微观结构出现由FCC向BCC的转变.同时,涂层的硬度、耐冲蚀性也显著提高.随着冲蚀角度的增加,涂层的冲蚀磨损量逐渐增加,表现出脆性材料的冲蚀磨损特性.在冲蚀角度为90°时,随着Al元素的增加,涂层的主要冲蚀磨损机理逐渐由微切削和锻造挤压转变为犁削.

Effect of Aluminum Content on the Microstructure and Erosion Wear Resistance of FeCrNiCoCu High-Entropy Alloy Coatings

Al_xFeCrNiCoCu (x=0, 1, 2, 3) high-entropy alloy coatings (HEAs) were prepared by spark plasma sintering. The effect of Al content on microstructure and erosion wear resistance of Al_xFeCrNiCoCu high-entropy alloy coatings were studied by x-ray diffraction, scanning electron microscopy and erosion wear tests. The results show that the coating microstructure was mainly composed of a Cu-rich phase and an Al-rich phase with simple FCC solid-solution structure. With the increasing Al content, the microstructure evolved gradually from FCC to BCC. And the hardness and erosion resistance of the HEA coatings were increased significantly. The mass loss rate of HEA coating increased with the increase of erosion angle, exhibiting an erosion characteristic of brittle materials. The domain erosion wear mechanism of the HEA coatings changed from micro-cutting and forging extrusion to ploughing with the increasing Al content.