Thermal activation parameters of plastic flow reveal deformation mechanisms in the CrMnFeCoNi high-entropy alloy

Laplanche, Guillaume; Bonneville, J.; Varvenne, C.; Curtin, W. A.; George, Easo P.

doi:10.1016/j.actamat.2017.10.014

Thermal activation parameters of plastic flow reveal deformation mechanisms in the CrMnFeCoNi high-entropy alloy

Journal Article · Fri Oct 06 00:00:00 EDT 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2017.10.014· OSTI ID:1409262

^[1]; Bonneville, J. ^[2]; Varvenne, C. ^[3]; Curtin, W. A. ^[4]; ^[5]

Ruhr-Univ., Bochum (Germany)
Univ. of Poitiers, Futuroscope Cedex (France)
Aix-Marseille Univ., Marseille (France)
EPRL, Lausanne (Switzerland)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

To reveal the operating mechanisms of plastic deformation in an FCC high-entropy alloy, the activation volumes in CrMnFeCoNi have been measured as a function of plastic strain and temperature between 77 K and 423 K using repeated load relaxation experiments. At the yield stress, σ_y, the activation volume varies from ~60 b3 at 77 K to ~360 b³ at 293 K and scales inversely with yield stress. With increasing plastic strain, the activation volume decreases and the trends follow the Cottrell-Stokes law, according to which the inverse activation volume should increase linearly with σ - σ_y (Haasen plot). This is consistent with the notion that hardening due to an increase in the density of forest dislocations is naturally associated with a decrease in the activation volume because the spacing between dislocations decreases. The values and trends in activation volume agree with theoretical predictions that treat the HEA as a high-concentration solid-solution-strengthened alloy. Lastly, these results demonstrate that this HEA deforms by the mechanisms typical of solute strengthening in FCC alloys, and thus indicate that the high compositional/structural complexity does not introduce any new intrinsic deformation mechanisms.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1409262

Alternate ID(s):: OSTI ID: 22740449
OSTI ID: 1495898

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 143; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Activation volume
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Thermal activation parameters of plastic flow reveal deformation mechanisms in the CrMnFeCoNi high-entropy alloy

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