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Origin of high strength in the CoCrFeNiPd high-entropy alloy

Binglun Yin1*, W. A. Curtin1

1 Laboratory for Multiscale Mechanics Modeling (LAMMM) and National Centre for Computational Design and Discovery of Novel Materials (NCCR MARVEL), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

* Corresponding authors emails: binglun.yin@epfl.ch
DOI10.24435/materialscloud:2020.0045/v1 [version v1]

Publication date: Apr 27, 2020

How to cite this record

Binglun Yin, W. A. Curtin, Origin of high strength in the CoCrFeNiPd high-entropy alloy, Materials Cloud Archive 2020.0045/v1 (2020), doi: 10.24435/materialscloud:2020.0045/v1.

Description

Recent experiments show that the CoCrFeNiPd high-entropy alloy (HEA) is significantly stronger than CoCrFeNi and with nanoscale composition fluctuations beyond those expected for random alloys. These fluctuations were suggested to be responsible for strengthening. Here, a recent parameter-free theory for initial yield strength in fcc random alloys is shown to predict the strength of CoCrFeNiPd in good agreement with experiments. The strengthening is due mainly to the large misfit volume of Pd in CoCrFeNi, indicating that the effects of the non-random composition fluctuations are secondary. Analyses of strength variations and strengthening-associated length scales help rationalize why dislocation motion is insensitive to such fluctuations. These findings point to the value of theory for understanding the mechanical behavior of HEAs.

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MRL_CoCrFeNiPd.tar.xz
MD5md5:809d2b6ea47e4070bb4993c22fe59fd6
10.7 MiB The VASP calculations of the alloys elastic constants.
README.txt
MD5md5:341f4d410b59dbc33f0412958b51848b
579 Bytes

License

Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.
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External references

Journal reference
B. Yin, W. A. Curtin, Materials Research Letters, 8, 209–215 (2020) doi:10.1080/21663831.2020.1739156

Keywords

High-entropy alloys palladium solute strengthening theory yield strength EPFL MARVEL/DD2

Version history:

2020.0045/v1 (version v1) [This version] Apr 27, 2020 DOI10.24435/materialscloud:2020.0045/v1