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Design of a twinning-induced plasticity high entropy alloy

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Acta Materialia

Elsevier BV

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      Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes

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        Microstructural development in equiatomic multicomponent 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
            Acta Materialia
            Acta Materialia
            Elsevier BV
            13596454
            August 2015
            August 2015
            : 94
            :
            : 124-133
            10.1016/j.actamat.2015.04.014
            © 2015

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