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3D printers; Additives; Alloying elements; Calculations; Cobalt alloys; Computation theory; Density (specific gravity); Density functional theory; Design for testability; High-entropy alloys; Iron alloys; Manganese alloys; Mechanical properties; Tensile testing; Thermodynamics, Ab initio calculations; Computational thermodynamics; Experimental verification; Microstructure analysis; Stacking fault energies; Toolsets; Twinning-induced plasticities, Aluminum alloys
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. © 2019 Acta Materialia Inc.