Inhibited Surface Diffusion in Nanoporous Multi-Principal Element Alloy Thin Films Prepared by Vacuum Thermal Dealloying

Das Gupta, Tibra; Balk, Thomas John

doi:10.3390/met14030289

Title: Inhibited Surface Diffusion in Nanoporous Multi-Principal Element Alloy Thin Films Prepared by Vacuum Thermal Dealloying

Journal Article · Thu Feb 29 00:00:00 EST 2024 · Metals

DOI:https://doi.org/10.3390/met14030289· OSTI ID:2317714

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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 high-temperature applications. In this study, nanoporous refractory multi-principal element alloys (np-RMPEAs) were fabricated from magnesium-based thin films (VMoNbTaMg) that had been prepared by magnetron sputtering. Vacuum thermal dealloying (VTD), which involves sublimation of a higher vapor pressure element, is a novel technique for synthesizing nanoporous refractory elements that are prone to oxidation. When VMoNbTaMg was heated under vacuum, a nanoporous structure was created by the sublimation of the highest vapor pressure element (Mg). X-ray photoelectron spectroscopy depth profiling indicated significantly less ligament oxidation during VTD as compared to traditional dealloying methods. Furthermore, np-RMPEAs exhibited outstanding stability against coarsening, retaining smaller ligaments (~25 nm) at elevated temperature (700 °C) for a prolonged period (48 h).

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0019402

OSTI ID:: 2317714

Journal Information:: Metals, Journal Name: Metals Vol. 14 Journal Issue: 3; ISSN 2075-4701

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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