SKM 2023 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 32: Topical Session: Defect Phases I
MM 32.3: Talk
Wednesday, March 29, 2023, 16:30–16:45, SCH A 216
Effect of chemical changes on the defect structures in lean rare-earth free ternary Mg alloys — •Wassilios Delis1, Deborah Neuß2, Marcus Hans2, Dierk Raabe3, Sandra Korte-Kerzel1, and Stefanie Sandlöbes-Haut1 — 1Institute for Physical Metallurgy and Materials Physics, RWTH Aachen University, Germany — 2Materials Chemistry, RWTH Aachen University, Germany — 3Max-Planck Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
Mg is a lightweight structural material with a good specific strength. Unfortunately, it lacks sufficient room temperature formability and therefore a wider commercial use of Mg is hindered. The preferred basal slip and strong basal-type texture were found to be the main reasons for the poor room temperature formability. Alloys containing low amounts of Al and Ca showed a highly increased room temperature ductility. Here, TEM and APT measurements and ab initio calculations showed an increased activity of < c+a > dislocation slip. The effects of the alloying elements are yet not fully understood. Further research has been performed to investigate how the changes in chemistry affect the structure of defects such as boundaries and dislocations.