TY - JOUR
T1 - Corrosion Behavior of Ultrafine‐Grained CoCrFeMnNi High‐Entropy Alloys Fabricated by High‐Pressure Torsion
AU - Shimizu, Haruka
AU - Yuasa, Motohiro
AU - Miyamoto, Hiroyuki
AU - Edalati, Kaveh
N1 - Funding Information:
Funding: This work was supported by Grants‐in‐Aid for Scientific Research on Innovative Areas on High Entropy Alloys (grant numbers 19H05178,19H05176, 21H00150 and 21H00155) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and by a grant from the IKETANI Foundation (2020 0321097‐A). The authors would like to thank Abe and Ohnuma of the National Institute for Materials Science (NIMS) for the calculation of phase diagrams to design the alloy compositions using CALPHAD.
Funding Information:
This work was supported by Grants‐in‐Aid for Scientific Research on Innovative Areas on High Entropy Alloys (grant numbers 19H05178,19H05176, 21H00150 and 21H00155) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and by a grant from the IKETANI Foundation (2020 0321097‐A). The authors would like to thank Abe and Ohnuma of the National Institute for Materials Science (NIMS) for the calculation of phase diagrams to design the alloy compositions using CALPHAD.
Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2022/2/1
Y1 - 2022/2/1
N2 - 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.
AB - 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.
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U2 - 10.3390/ma15031007
DO - 10.3390/ma15031007
M3 - Article
AN - SCOPUS:85123458415
SN - 1996-1944
VL - 15
JO - Materials
JF - Materials
IS - 3
M1 - 1007
ER -