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Combined Al and C alloying enables mechanism-oriented design of multi-principal element alloys

Ab initio calculations and experiments
: Kies, Fabian; Ikeda, Yuji; Ewald, Simon; Schleifenbaum, Johannes Henrich; Hallstedt, Bengt; Körmann, Fritz; Haase, Christian


Scripta materialia 178 (2020), pp.366-371
ISSN: 1359-6462
Journal Article
Fraunhofer ILT ()
additive manufacturing; mechanical properties; density functional theory

Density functional theory (DFT) calculations were performed on Al x C y CoFeMnNi 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, Al 0.26 C y CoFeMnNi 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.