Article Dans Une Revue Scripta Materialia Année : 2021

From diluted solid solutions to high entropy alloys: Saturation grain size and mechanical properties after high pressure torsion

Résumé

Effects of solutes on saturation grain size and mechanical properties are investigated for the Cantor alloy and Ni-enriched variations ((CrMnFeCo)xNi1-x) with x=0.8, 0.4, 0.08 and 0. Indentation on coarse-grained and severely deformed states shows increasing hardness with increasing alloying content due to higher solid solution strengthening and Hall-Petch contributions. Nanoindentation strain rate jump tests reveal similar rate sensitivities of the deformed states without pronounced transient regimes. All compositions exhibit a history dependent softening indicating an unstable microstructure. The saturation grain size ds after HPT deformation inversely correlates with the solid solution strengthening contribution, i.e. the higher Δτ the lower ds.

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hal-03450631 , version 1 (26-11-2021)

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Tom Keil, Enrico Bruder, Mathilde Laurent-Brocq, Karsten Durst. From diluted solid solutions to high entropy alloys: Saturation grain size and mechanical properties after high pressure torsion. Scripta Materialia, 2021, 192, pp.43-48. ⟨10.1016/j.scriptamat.2020.09.046⟩. ⟨hal-03450631⟩
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