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Controlled Valence Electron Concentration Approach to Tailor the Microstructure and Phase Stability of an Entropy-Enhanced AlCoCrFeNi Alloy

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Abstract

In this study, the alloying and phase separation behaviors of AlCoCrFeNi-based high-entropy alloys (HEAs) were investigated. The valence electron concentration (VEC) of the AlCoCrFeNi HEA was modified by adding specific elements (Mg, Ti, Mn, Cu, and Zn) to produce biphasic HEAs. These HEAs were prepared by mechanical alloying for 30 hours, followed by the consolidation of the powders at 1000 °C. The results demonstrated the formation of a body-centered cubic (ordered BCC/B2) phase in AlCoCrFeNi–Mg and AlCoCrFeNi–Ti, while a dual-phase face-centered cubic (FCC) phase and minor BCC phases were observed in AlCoCrFeNi–Cu and AlCoCrFeNi–Zn. AlCoCrFeNi and AlCoCrFeNi–Mn exhibited the precipitation of a σ phase in the BCC matrix and a minor FCC phase. The AlCoCrFeNi–Mn HEA exhibited the highest compressive strength among itself, AlCoCrFeNi–Cu, and AlCoCrFeNi–Zn HEAs, owing to the precipitation of a harder σ phase and a higher ordered BCC/B2 fraction. In addition, the AlCoCrFeNi–Cu and AlCoCrFeNi–Zn HEAs exhibited the maximum fracture strain and absorption energies. We propose that a controlled VEC approach by the addition of suitable elements can be used to tailor the microstructure and phase stability of AlCoCrFeNi HEAs.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. 2021R1A2C1005478), (No. 2021R1F1A1062039), (No. 2021R1A4A1031357).

Author Contributions

MCO: conceptualization, methodology, validation, investigation, formal analysis, resources, writing–original draft, writing–review & editing. AS: investigation, resources, data curation, writing–review & editing, visualization, funding acquisition. HL: investigation, data curation, writing–original draft, writing–review & editing. BA: conceptualization, methodology, writing–review & editing, supervision, project administration, funding acquisition.

Competing interests

The authors declare that they have no known competing financial interests or personal relationships that could have influenced the work reported in this paper.

Funding

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. 2021R1A2C1005478), (No. 2021R1F1A1062039), (No. 2021R1A4A1031357).

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The data required to reproduce these findings cannot be shared at present, as the research data are confidential.

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  1. Min Chul Oh and Hansung Lee have contributed equally to this work.

Authors and Affiliations

  1. Department of Materials Science and Engineering, Ajou University, Suwon, 16499, Gyeonggi-do, Korea

    Min Chul Oh, Ashutosh Sharma & Byungmin Ahn

  2. A.I. & Mechanical System Center, Institute for Advanced Engineering, Yongin, 17180, Gyeonggi-do, Korea

    Min Chul Oh

  3. Department of Energy Systems Research, Ajou University, Suwon, 16499, Gyeonggi-do, Korea

    Hansung Lee & Byungmin Ahn

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  1. Min Chul Oh
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Oh, M.C., Lee, H., Sharma, A. et al. Controlled Valence Electron Concentration Approach to Tailor the Microstructure and Phase Stability of an Entropy-Enhanced AlCoCrFeNi Alloy. Metall Mater Trans A 53, 1831–1844 (2022). https://doi.org/10.1007/s11661-022-06637-x

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