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MM: Fachverband Metall- und Materialphysik
MM 4: Structural Materials
MM 4.9: Vortrag
Montag, 5. September 2022, 12:30–12:45, H46
Oxidation mechanisms of SMART alloys and MAX phases — •Anicha Reuban1,2, Jesus Gonzalez-Julian1,2, Ivan Povstugar1, Andrey Litnovsky1,3, and Christian Linsmeier1 — 1Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — 2Institute of Mineral Engineering, RWTH Aachen University, 52064 Aachen, Germany — 3Moscow
Concentrated Solar Power (CSP) is a sustainable energy technology where sunlight is focused on a solar receiver and the thermal energy is used to generate electricity. The receiver must withstand temperatures greater than 1000 ∘C, be resistant to oxidation by air and/or corrosion by molten salts and and maintain its properties over time. Self-passivating SMART alloys, originally designed for the fusion reactor, are resistant to plasma sputtering and can suppress oxidation in case of an accident with air ingress, up to 1000 ∘C. MAX phases, a bridge between metals and ceramics, are lightweight, easily machinable materials, oxidation- and corrosion-resistant up to 1400 ∘C. To understand the oxidation mechanisms in these materials, it is important to obtain nanoscale information using advanced characterization techniques such as Atom Probe Tomography (APT). According to the APT analysis of the SMART alloy W-Cr-Y, Y segregates at oxide grain boundaries while in the alloy it forms Y-O precipitates. Further analyses are being performed to get more information about the role of Y in the oxidation process. Electron microscopy is used along with APT for a correlative approach to nanoscale characterization.