| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Elements Alloys X: Alloy Development and Properties
|
| Presentation Title |
Corrosion of Single-phase Ni-Fe-Cr-Mo-W-X Non-equimolar Multi-principal Element Alloys |
| Author(s) |
Gerald S. Frankel, Anup Panindre, Yehia Khalifa, Christopher Taylor, Pin Lu, John Scully |
| On-Site Speaker (Planned) |
Gerald S. Frankel |
| Abstract Scope |
Single-phase Ni-Fe-Cr-Mo-W-X (X=Ru, Mn, Al, and Cu) MPEAs were designed using an approach combining empirical knowledge about corrosion resistance and thermodynamic calculations. Each MPEA in this study contains minimum 20 at.% Cr. The MPEA that contains 13 at.% Ru exhibits excellent resistance to general as well as localized corrosion, even in Cl-environments as harsh as 6 M HCl. Ruthenium is believed to play a key role in conferring passivity to this alloy. Five more MPEAs were created by substituting Ru with commodity elements such as Mn, Al, and Cu. Each Ru-free alloy was found to resist localized corrosion at ambient temperature. Despite forming oxide films of similar thickness and quality as evaluated using single-frequency impedance methods, X-ray photoelectron spectroscopy of the passivated surface revealed constituent elements to dissolve in a non-congruent fashion. Unlike the Ru-containing MPEA, exclusive Cr enrichment was not evident in their passive films. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Environmental Effects, |