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MM: Fachverband Metall- und Materialphysik
MM 15: Poster session I
MM 15.10: Poster
Monday, March 7, 2016, 18:00–20:00, Poster B3
Rapid theory-guided prototyping of ductile Mg alloys — Zongrui Pei1, 2, •Martin Friák3, 1, 2, Stefanie Sandlöbes4, 1, Bob Svendsen1,2,5, Dierk Raabe1, and Jörg Neugebauer1 — 1Max-Planck-Institut für Eisenforschun, GmbH, Düsseldorf, Germany — 2Aachen Institute for Advanced Study in Computational Engineering Science (AICES), RWTH Aachen, Aachen, Germany — 3Institute of Physics of Materials, Brno, Czech Republic — 4Institute of Physical Metallurgy and Metal Physics, RWTH Aachen, Aachen, Germany — 5Material Mechanics, Faculty of Georesources and Materials Engineering, RWTH Aachen, Aachen, Germany
Magnesium alloys are promising structural materials with high specific strength. However, their broader use is limited by their low formability at ambient temperatures. It is known that Mg alloys containing small amounts of yttrium or rare-earth (RE) elements exhibit up to 5 times higher room temperature ductility but finding other solutes with the same effect is highly desirable. In order to identify a method allowing for a corresponding rapid alloy and solute assessment, we analyze relations between the I1 stacking fault energies, which were shown to be related to the macroscopic ductility in Mg alloys (Acta Mater. 60 (2012) 3011), and the atomic volume V of pure solutes, their electronegativity ν and bulk modulus B. Comparing the impact of solutes with that of yttrium we propose a single numerical quantity (called yttrium similarity index, YSI) that is based on these interrelations. We evaluate YSI for 2850 Mg-ternaries and identify 133 promising solute pairs not including any RE elements (New J. Phys. 17 (2015) 093009).