About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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High Entropy Alloys VIII
|
Presentation Title |
J-56: Passivation Phenomena in Highly Corrosion Resistant High Entropy Alloys: An Evaluation of the Role of Chromium Content |
Author(s) |
Angela Y. Gerard, Junsoo Han, Stephen McDonnell, Dan Schreiber, Pin Lu, James Saal, Wolfgang Windl, Gerald Frankel, John Scully |
On-Site Speaker (Planned) |
Angela Y. Gerard |
Abstract Scope |
Single phase multi-principle element alloys (MPEAs) with exceptional corrosion resistance in aqueous environments have been recently reported. A topic of great interest concerning MPEAs is the nature of the protective passive film and the key attributes that contribute to excellent corrosion resistance. Many oxide types have been reported for MPEAs, such as crystalline stoichiometric single cation oxides, complex non-stoichiometric oxides, and high entropy oxides. In this talk, the passivation behavior of several single phase Ni38Fe20CrxMn21-0.5xCo21-0.5x HEAs is reported over Cr concentrations ranging from 6 to 22 at.%. Passivation was investigated utilizing various in-situ electrochemical techniques as well as atomic emission spectro-electrochemistry. Ex-situ characterization of the oxide Cr cation fractions was determined using XPS and 3-D atom probe tomography. Findings were compared to Ni-Cr, Fe-Cr, and Co-Cr binary solid solution alloys over a similar range in Cr contents. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |