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      Mechanical properties, microstructure and thermal stability of a nanocrystalline CoCrFeMnNi high-entropy alloy after severe plastic deformation

      , , , , , ,
      Acta Materialia
      Elsevier BV

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          A fracture-resistant high-entropy alloy for cryogenic applications.

          High-entropy alloys are equiatomic, multi-element systems that can crystallize as a single phase, despite containing multiple elements with different crystal structures. A rationale for this is that the configurational entropy contribution to the total free energy in alloys with five or more major elements may stabilize the solid-solution state relative to multiphase microstructures. We examined a five-element high-entropy alloy, CrMnFeCoNi, which forms a single-phase face-centered cubic solid solution, and found it to have exceptional damage tolerance with tensile strengths above 1 GPa and fracture toughness values exceeding 200 MPa·m(1/2). Furthermore, its mechanical properties actually improve at cryogenic temperatures; we attribute this to a transition from planar-slip dislocation activity at room temperature to deformation by mechanical nanotwinning with decreasing temperature, which results in continuous steady strain hardening. Copyright © 2014, American Association for the Advancement of Science.
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            High-Entropy Alloys: A Critical Review

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              Bulk nanostructured materials from severe plastic deformation

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                Author and article information

                Journal
                Acta Materialia
                Acta Materialia
                Elsevier BV
                13596454
                September 2015
                September 2015
                : 96
                :
                : 258-268
                Article
                10.1016/j.actamat.2015.06.025
                87352201-336b-442f-8dd0-4e821af4af08
                © 2015
                History

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