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

Fabian Kies*, Yuji Ikeda, Simon Ewald, Johannes H. Schleifenbaum, Bengt Hallstedt, Fritz Körmann, Christian Haase

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)
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    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.

    Original languageEnglish
    Pages (from-to)366-371
    JournalScripta Materialia
    Volume178
    DOIs
    Publication statusPublished - 2020

    Bibliographical note

    Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care

    Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

    Keywords

    • Additive manufacturing
    • Density functional theory (DFT)
    • High-entropy alloy
    • Mechanical properties
    • Multi-principal element alloy

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