From diluted solid solutions to high entropy alloys: Saturation grain size and mechanical properties after high pressure torsion. (February 2021)

• Record Type: Journal Article
• Authors: Keil, Tom; Bruder, Enrico; Laurent-Brocq, Mathilde; Durst, Karsten
• Is Part Of: Scripta materialia. Number 192(2021)
• Page Start: 43
• Page End: 48
• Publication Date: 2021-02
• Subjects: High Entropy Alloy -- High pressure torsion -- Nanoindentation -- Microstructure; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.09.046
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Effects of solutes on saturation grain size and mechanical properties are investigated for the Cantor alloy and Ni-enriched variations ((CrMnFeCo)x Ni1-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 . Graphical abstract: Image, graphical abstract