About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Self-organizing Nano-architectured Materials
|
Presentation Title |
Nanoporous Refractory Multi-principal Element Alloy Thin Films for Higher Temperature Application Fabricated by Vacuum Thermal Dealloying |
Author(s) |
Tibra Das Gupta, Thomas John Balk |
On-Site Speaker (Planned) |
Tibra Das Gupta |
Abstract Scope |
Nanoporous structures with 3D interconnected networks are traditionally made by dealloying a binary precursor. Certain approaches for fabricating these materials have been applied to refractory multi-principal element alloys (RMPEAs), which can be suitable candidates for higher temperature applications. In this study, nanoporous refractory multi-principal element alloys (np-RMPEAs) were fabricated using single- and multi-layered magnesium-based thin films (VMoNbTaMg) that had been magnetron sputtered. Vacuum thermal dealloying (VTD), which involves sublimation of a higher vapor pressure element, is a novel technique for synthesizing these nanoporous refractory elements that are prone to oxidation. When VMoNbTaMg was heated under vacuum, a nanoporous structure was created by sublimation of the highest vapor pressure element (Mg). XPS depth profiling indicated less ligament oxidation during VTD as compared to traditional dealloying methods. np-RMPEAs exhibited outstanding stability against coarsening, retaining smaller ligaments (~25-30 nm) at higher temperature (700˚C) for a prolonged period (48 hours). |
Proceedings Inclusion? |
Undecided |