About this Abstract |
Meeting |
3rd World Congress on High Entropy Alloys (HEA 2023)
|
Symposium
|
HEA 2023
|
Presentation Title |
Third Element Effect of FeCrAl in Aqueous Environments |
Author(s) |
Catherine Lynch |
On-Site Speaker (Planned) |
Catherine Lynch |
Abstract Scope |
The third element effect refers to the component of a ternary alloy which forms an oxide of intermediate stability to the other two metals. This third element reduces the concentration of the oxide-forming component required for protective oxide film formation. This effect is studied in the FeCrAl system to observe the interrelationship between chromium and aluminum on film growth under low pH Na2SO4 corrosive environments. This work examines elemental interactions obscured in more complex multi-principal element alloys. While FeAl binaries form poorly protective oxides in aqueous environments, adding aluminum to FeCr alloys generates a protective chromia film below the standard chromium threshold. Linear sweep voltammetry of FeCrAl ternaries with 10at% Cr and variable Al concentrations indicates Al improves the passivation performance of low Cr FeCrAl alloys. Electrochemical impedance spectroscopy is used to explore the growth rate of these films and X-ray photoelectron spectroscopy is used to characterize the films’ composition and valence states, exploring the underlying mechanisms of this phenomenon. |
Proceedings Inclusion? |
Planned: Metallurgical and Materials Transactions |