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      High-entropy alloys: a critical assessment of their founding principles and future prospects

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      International Materials Reviews
      Informa UK Limited

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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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              Die Konstitution der Mischkristalle und die Raumf�llung der Atome

              L. Vegard (1921)
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                Author and article information

                Journal
                International Materials Reviews
                International Materials Reviews
                Informa UK Limited
                0950-6608
                1743-2804
                May 11 2016
                May 11 2016
                : 61
                : 3
                : 183-202
                Article
                10.1080/09506608.2016.1180020
                fa4601c7-5ea1-440d-aa0f-920fd4bcb58c
                © 2016

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