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      High-entropy alloys

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      Nature Reviews Materials
      Springer Science and Business Media LLC

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          A critical review of high entropy alloys and related concepts

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            Microstructures and properties of high-entropy alloys

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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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                Author and article information

                Journal
                Nature Reviews Materials
                Nat Rev Mater
                Springer Science and Business Media LLC
                2058-8437
                August 2019
                June 18 2019
                August 2019
                : 4
                : 8
                : 515-534
                Article
                10.1038/s41578-019-0121-4
                0daa3160-fe8e-46d4-ac8a-6c4569f66ab4
                © 2019

                http://www.springer.com/tdm

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