Corrosion and Thermal Stability of CrMnFeNi High Entropy Alloy in Molten FLiBe Salt

The corrosion behavior of the FCC Cr 18 Mn 27 Fe 27.5 Ni 27.5 high entropy alloy (HEA) after exposure to molten FLiBe salt at 700 °C for 1000 hours, has been investigated. Results show that the HEA lost a higher mass compared to the reference 316 H stainless steel due to the dissolution of Mn into t...

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Bibliographic Details
Published in:Scientific reports 2019-12, Vol.9 (1), p.18993-10, Article 18993
Main Authors: Elbakhshwan, Mohamed, Doniger, William, Falconer, Cody, Moorehead, Michael, Parkin, Calvin, Zhang, Chuan, Sridharan, Kumar, Couet, Adrien
Format: Article
Language:English
Subjects:
639/301/1023
639/301/1023/1026
Corrosion
Humanities and Social Sciences
MATERIALS SCIENCE
Metals and alloys
multidisciplinary
Salts
Science
Science (multidisciplinary)
Structural materials
Thermal stability
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Summary:The corrosion behavior of the FCC Cr 18 Mn 27 Fe 27.5 Ni 27.5 high entropy alloy (HEA) after exposure to molten FLiBe salt at 700 °C for 1000 hours, has been investigated. Results show that the HEA lost a higher mass compared to the reference 316 H stainless steel due to the dissolution of Mn into the molten salt. The loss of Mn from the alloy appeared to discourage the dissolution of Cr in the molten fluoride salts which is widely recognized as the mechanism of corrosion degradation. Thermal exposure at 700 °C for 1000 hours also led to the precipitation of an additional BCC phase Cr 67 Fe 13 Mn 18.5 Ni 1.5 , which was confirmed by CALPHAD predictions.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-55653-2