Abstract In this work, a rapid-solidification method was utilized on FeCoNiAl0.2Si0.2 high entropy alloy (HEA) and its effects on microstructure, corrosion resistance and magnetic properties were systematically investigated. Rapid-solidified and slowly-cooled FeCoNiAl0.2Si0.2 specimens were produced by melt-spinning and induction melting, respectively. It was found that, slowly-cooled FeCoNiAl0.2Si0.2 exhibits dendrite structure with compositional segregation of Al, Si and Ni, as well as the precipitation of L12-type ordered phase in the solid solution matrix, while rapid-solidification effectively promotes the structural and compositional homogeneity. Moreover, rapid-solidification leads to significant enhancement in the stability of the passive film, and thus results in remarkable increase in corrosion resistance compared to its slowly-cooled counterpart. Besides, the distribution of constituent elements plays an important role in the formation of passive film on the surface of this HEA. In addition, the Hc of the rapid-solidified specimen exhibits only nearly 1/5 of its slowly-cooled counterpart, indicating significant positive effect of rapid-solidification on soft magnetic properties of FeCoNiAl0.2Si0.2. This work provides a novel route for further development of HEAs with excellent corrosion resistance and soft magnetism.

中文翻译：

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快速凝固提高FeCoNiAl0.2Si0.2高熵合金的耐蚀性和磁性能

摘要 在这项工作中，利用快速凝固方法对 FeCoNiAl0.2Si0.2 高熵合金 (HEA) 进行了系统研究，并系统地研究了其对组织、耐腐蚀性和磁性能的影响。快速凝固和缓慢冷却的 FeCoNiAl0.2Si0.2 试样分别通过熔体旋压和感应熔炼制成。研究发现，缓慢冷却的 FeCoNiAl0.2Si0.2 呈现枝晶结构，Al、Si 和 Ni 的成分偏析，以及固溶体基体中 L12 型有序相的析出，而快速凝固有效地促进了结构和成分的同质性。此外，快速凝固导致钝化膜稳定性的显着增强，因此与缓慢冷却的对应物相比，耐腐蚀性显着提高。此外，组成元素的分布在该HEA表面钝化膜的形成中起重要作用。此外，快速凝固试样的 Hc 仅为其慢冷试样的近 1/5，表明快速凝固对 FeCoNiAl0.2Si0.2 的软磁性能有显着的积极影响。这项工作为进一步开发具有优异耐腐蚀性和软磁性的 HEA 提供了一条新途径。表明快速凝固对 FeCoNiAl0.2Si0.2 的软磁性能有显着的积极影响。这项工作为进一步开发具有优异耐腐蚀性和软磁性的 HEA 提供了一条新途径。表明快速凝固对 FeCoNiAl0.2Si0.2 的软磁性能有显着的积极影响。这项工作为进一步开发具有优异耐腐蚀性和软磁性的 HEA 提供了一条新途径。