Thermal activation parameters of plastic flow reveal deformation mechanisms in the CrMnFeCoNi high-entropy alloy
By G. Laplanche, J. Bonneville, C. Varvenne, W. A. Curtin, Easo P. George. 2018
173 citations recorded by the source corpus.
Abstract 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. 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 Paper: https://www.semanticscholar.org/paper/cabbdf0929e448d1d2e319b3192ad537690b705e
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Citations in the corpus
- Mechanical properties of high-entropy alloys with emphasis on face-centered cubic alloys (2019, methodology): “[63] to conclude that these single-phase HEAs deform by the mechanisms that are not atypical of any other solute-strengthened fcc alloys, i.”