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Effect of high Fe content on the microstructure, mechanical and corrosion properties of AlCoCrFeNi high-entropy alloy coatings prepared by gas tungsten arc cladding
Surface & Coatings Technology ( IF 5.4 ) Pub Date : 2021-04-30 , DOI: 10.1016/j.surfcoat.2021.127242
Qingkai Fan , Chao Chen , Chenglei Fan , Zeng Liu , Xiaoyu Cai , Sanbao Lin , Chunli Yang

Arc cladding high-entropy alloy (HEA) coatings have the advantages of low cost and flexibility. It exhibits economic value to increase the proportion of Fe element in HEA systems. As a result, low-cost AlCoCrFeNi (Fe content of 42.5 at.%, 44.9 at.%, 47.5 at.%, 50.4 at.%) HEA coatings are prepared by gas tungsten arc (GTA) cladding and their microstructure, mechanical properties, and corrosion properties are investigated by XRD, SEM, EBSD, microhardness, nanoindentation, OCP, potentiodynamic polarization, and EIS. The valence electron concentration (VEC) plays an important role in the formation of phase structure. With the increase of Fe content, the phase structure of coating alloys changes from BCC to BCC + FCC, and the morphology changes from equiaxed grains to a dendritic structure. Coating alloy with higher Fe content displays lower microhardness and more active creep deformation due to the higher FCC fraction. The dual-phase (BCC + FCC) structure induces galvanic corrosion and deteriorates the corrosion properties. This work contributes to the fabrication of large-thickness and large-area HEA coatings at a low cost and provides an experimental basis for Fe-rich HEA design.



中文翻译:

高铁含量对气体钨极电弧熔覆AlCoCrFeNi高熵合金涂层组织,力学性能和腐蚀性能的影响

电弧熔覆高熵合金(HEA)涂层具有成本低和灵活性高的优点。提高HEA系统中Fe元素的比例具有经济价值。结果,通过气体钨极电弧(GTA)熔覆制备了低成本的AlCoCrFeNi(Fe含量为42.5 at。%,44.9 at。%,47.5 at。%,50.4 at。%)HEA涂层及其微观结构,机械性能并通过XRD,SEM,EBSD,显微硬度,纳米压痕,OCP,电位动力学极化和EIS研究了腐蚀性能。价电子浓度(VEC)在相结构的形成中起重要作用。随着Fe含量的增加,涂层合金的相结构从BCC转变为BCC + FCC,形貌从等轴晶转变为枝晶结构。Fe含量较高的涂层合金由于FCC分数较高,因此具有较低的显微硬度和更有效的蠕变变形。双相(BCC + FCC)结构引起电化腐蚀并降低腐蚀性能。这项工作有助于以低成本制造大厚度和大面积的HEA涂层,并为富铁HEA设计提供了实验基础。

更新日期:2021-05-04
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