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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.


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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External references

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


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