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MM: Fachverband Metall- und Materialphysik
MM 53: Structural Materials (Steels, light-weight materials, high-temperature materials) - II
MM 53.2: Vortrag
Donnerstag, 19. März 2020, 12:00–12:15, BAR 205
Alloying impact on phase stability in ZrAl3 — •Dominik Gehringer1, Florian Schmid2, Stefan Pogatscher2, and David Holec1 — 1Department of Materials Science, Montanuniversität Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria — 2Christian Doppler Laboratory for Advanced Aluminium Alloys, Chair of Nonferrous Metallurgy, Montanuniversität Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria
During homogenization, Al3Zr-particles precipitate out of super-saturated Zr-alloyed aluminum alloys and serve for grain size stabilization via Zener drag and can contribute to an increased strength. Al3Zr exhibits three different crystal structures, L12, D022 and D023 but only the L12 shows a favorable coherent interface with the aluminum matrix. Here we present an ab initio study of alloying impact on their stability by considering 16 doping elements. Three criteria were considered: site preference for the alloying elements, formation energies and stacking fault energies acting as a kinetic stabilization complementing the alloy design based solely on thermodynamics. In our contribution we will present the above described analysis in detail together with the suggested novel alloys. These predictions will be corroborated by our preliminary experimental results.