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      Decomposition of the single-phase high-entropy alloy CrMnFeCoNi after prolonged anneals at intermediate temperatures

      , , , , , ,
      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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            Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 refractory high entropy alloys

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              The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy

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                Author and article information

                Journal
                Acta Materialia
                Acta Materialia
                Elsevier BV
                13596454
                June 2016
                June 2016
                : 112
                :
                : 40-52
                Article
                10.1016/j.actamat.2016.04.005
                7ca32f01-31b2-479e-b7f3-0e4b8fd201d5
                © 2016
                History

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