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Combined Al and C alloying enables mechanism-oriented design of multi-principal element alloys: Ab initio calculations and experiments

2019; Elsevier BV; Volume: 178; Linguagem: Inglês

10.1016/j.scriptamat.2019.12.004

1872-8456

Fabian Kies, Yuji Ikeda, Simon Ewald, Johannes Henrich Schleifenbaum, Bengt Hallstedt, Fritz Körmann, Christian Haase,

Intermetallics and Advanced Alloy Properties

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.