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

Haruka Shimizu, Motohiro Yuasa, Hiroyuki Miyamoto, Kaveh Edalati

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

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 H2SO4 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 nano-crystalline structure produced by SPD on the corrosion behavior was negligibly small. This is in-consistent 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.

本文言語英語
論文番号1007
ジャーナルMaterials
15
3
DOI
出版ステータス出版済み - 2月 1 2022

!!!All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学

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