Combined Al and C alloying enables mechanism-oriented design of multi-principal element alloys: Ab initio calculations and experiments. (15th March 2020)

• Record Type: Journal Article
• Authors: Kies, Fabian; Ikeda, Yuji; Ewald, Simon; Schleifenbaum, Johannes H.; Hallstedt, Bengt; Körmann, Fritz; Haase, Christian
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 366
• Page End: 371
• Publication Date: 2020-03-15
• Subjects: Multi-principal element alloy -- High-entropy alloy -- Additive manufacturing -- Density functional theory (DFT) -- Mechanical properties; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.12.004
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: Density functional theory (DFT) calculations were performed on Alx Cy 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, Al0.26 Cy 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.