Combined Al and C alloying enables mechanism-oriented design of multi-principal element alloys
Ab initio calculations and experiments
Fabian Kies (RWTH Aachen University)
Yuji Ikeda (Max-Planck-Institut für Eisenforschung, University of Stuttgart)
Simon Ewald (RWTH Aachen University)
Johannes H. Schleifenbaum (Fraunhofer Institute for Laser Technology (ILT), RWTH Aachen University)
Bengt Hallstedt (RWTH Aachen University)
Fritz Körmann (TU Delft - (OLD) MSE-7, Max-Planck-Institut für Eisenforschung)
Christian Haase (RWTH Aachen University)
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Abstract
Density functional theory (DFT) calculations were performed on AlxCyCoFeMnNi multi-principal element alloys (MPEAs) to understand the influence of Al and C on the stacking-fault energy (SFE). C addition to CoFeMnNi resulted in increased SFE, while it decreased in Al-alloyed CoFeMnNi. For experimental verification, Al0.26CyCoFeMnNi with 0, 1.37 and 2.70 at% C were designed by computational thermodynamics, produced by additive manufacturing (AM) and characterized by tensile tests and microstructure analysis. Twinning-induced plasticity (TWIP) was enhanced with increased C, which confirmed a decreased SFE. The combination of these methods provides a promising toolset for mechanism-oriented design of MPEAs with advanced mechanical properties.