Abstract The as-cast microstructures and corrosion behaviors of the FeCoNiCrx (x = 0, 0.5, 1.0) multi-principal element alloys in both 0.5 M sulfuric acid and 3.5% sodium chloride solutions were systematically investigated. With the increased content of Cr, the as-cast microstructure shows a cellular-dendrite transformation due to the Cr-induced segregation. FeCoNiCr0.5 alloy exhibits an outstanding anticorrosion performance in both 0.5 M sulfuric acid and 3.5% sodium chloride solutions, while the excess addition of Cr element leads to the noticeable localized corrosion in FeCoNiCr alloy. The results indicate that the distribution of Cr element plays a non-ignorable role in the anticorrosion performance for FeCoNiCr-based multi-principal element alloy.

中文翻译：

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FeCoNiCr (x = 0, 0.5, 1.0) 多主元素合金的腐蚀行为：Cr 诱导偏析的作用

摘要 系统研究了 FeCoNiCrx (x = 0, 0.5, 1.0) 多主元素合金在 0.5 M 硫酸和 3.5% 氯化钠溶液中的铸态组织和腐蚀行为。随着 Cr 含量的增加，由于 Cr 引起的偏析，铸态组织显示出蜂窝状枝晶转变。FeCoNiCr0.5 合金在 0.5 M 硫酸和 3.5% 氯化钠溶液中均表现出优异的防腐性能，而过量添加 Cr 元素导致 FeCoNiCr 合金出现明显的局部腐蚀。结果表明，Cr元素的分布对FeCoNiCr基多主元素合金的防腐性能起着不可忽视的作用。