SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 37: Topical Session: Defect Phases II
MM 37.8: Vortrag
Donnerstag, 30. März 2023, 12:45–13:00, SCH A 216
Influence of stoichiometric change on plasticity in the Ca(Al;Mg)2 C15-Laves Phase — •Martina Freund1, Pei-Ling Sun1, Carsten Thomas2, Deborah Neuß3, Michael Feuerbacher2, Marcus Hans3, and Sandra Korte-Kerzel1 — 1Institut für Metallkunde und Materialphysik, RWTH Aachen University — 2Ernst Ruska-Centrum für Mikroskopie und Spektroskopie mit Elektronen und Peter-Grünberg Institut Forschungszentrum Jülich GmbH — 3Materials Chemistry, RWTH Aachen University
Magnesium is a promising material for light weight applications but is strongly limited because of its low room temperature ductility and low creep resistance. By alloying with Al and Ca dif-ferent Laves phases form, which improve creep strength properties. We did investigations of the stoichiometric C15 Laves phase, finding slip on {111} and {112} planes with the same ac-tivation frequency and approximately same CRSS values. The influence of the stoichiometry regarding the plasticity was analysed using a sample with 6at.-% Mg, by nanoindentation tests, APT and TEM. Hardness and indentation modulus values were in the same range for all indented orientations. Comparing this to the stoichiometric one, the hardness has shown a slight increase around 1 GPa. Changes of plasticity were seen by analysing resulting slip lines. Most activated slip planes were the {112} planes, followed by the {110}. APT was done for both, the stoichiometric and the off-stoichiometric, to evaluate the local chemistry on {112} slip planes. Ultimately, we aim to reveal the connection between the local chemical potential and motion of dislocations on different slip planes.