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

Authors
  • Kies, Fabian (author)
  • Ikeda, Yuji (author)
  • Ewald, Simon (author)
  • Schleifenbaum, Johannes H. (author)
  • Hallstedt, Bengt (author)
  • Körmann, F.H.W. (author)
  • Haase, Christian (author)
Publication Date
Jan 01, 2020
Identifiers
DOI: 10.1016/j.scriptamat.2019.12.004
OAI: oai:tudelft.nl:uuid:af1d74d2-751b-469a-bb2e-41646178d4b1
Source
TU Delft Repository
Keywords
Language
English
License
Unknown
External links

Abstract

<p>Density functional theory (DFT) calculations were performed on Al<sub>x</sub>C<sub>y</sub>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<sub>0.26</sub>C<sub>y</sub>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.</p> / Accepted Author Manuscript / MSE-7

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