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高压扭转制备的超细晶CoCrFeMnNi高熵合金的腐蚀行为

Corrosion Behavior of Ultrafine-Grained CoCrFeMnNi High-Entropy Alloys Fabricated by High-Pressure Torsion.

作者信息

Shimizu Haruka, Yuasa Motohiro, Miyamoto Hiroyuki, Edalati Kaveh

机构信息

Graduate School of Mechanical Engineering, Doshisha University, Kyotanabe 610-0394, Japan.

Department of Mechanical Engineering, Doshisha University, Kyotanabe 610-0394, Japan.

出版信息

Materials (Basel). 2022 Jan 27;15(3):1007. doi: 10.3390/ma15031007.

DOI:10.3390/ma15031007
PMID:35160952
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8838792/
Abstract

The influence of the nanocrystalline structure produced by severe plastic deformation (SPD) on the corrosion behavior of CoCrFeMnNi alloys with Cr contents ranging from 0 to 20 at.% was investigated in aqueous 0.5 M HSO and 3.5% NaCl solutions. The resistance to general corrosion and pitting became higher in both the solutions, with higher passivation capability observed with increasing Cr content, and it is believed that the high corrosion resistance of CoCrFeMnNi alloys can be attributed to the incorporation of the Cr element. However, the impact of the nanocrystalline structure produced by SPD on the corrosion behavior was negligibly small. This is inconsistent with reports on nanocrystalline binary Fe-Cr alloys and stainless steels processed by SPD, where grain refinement by SPD results in higher corrosion resistance. The small change in the corrosion behavior with respect to grain refinement is discussed, based on the passivation process of Fe-Cr alloys and on the influence of the core effects of HEAs on the passivation process.

摘要

研究了严重塑性变形（SPD）产生的纳米晶结构对Cr含量为0至20原子百分比的CoCrFeMnNi合金在0.5 M H₂SO₄水溶液和3.5% NaCl溶液中的腐蚀行为的影响。在两种溶液中，合金的耐全面腐蚀和点蚀性能均有所提高，随着Cr含量的增加，钝化能力增强，并且认为CoCrFeMnNi合金的高耐蚀性可归因于Cr元素的加入。然而，SPD产生的纳米晶结构对腐蚀行为的影响极小。这与关于通过SPD处理的纳米晶二元Fe-Cr合金和不锈钢的报道不一致，在这些报道中，SPD导致的晶粒细化会提高耐蚀性。基于Fe-Cr合金的钝化过程以及高熵合金的核心效应在钝化过程中的影响，讨论了腐蚀行为随晶粒细化的微小变化。

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