A fracture-resistant high-entropy alloy for cryogenic applications

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Bernd Gludovatz
  • Anton Hohenwarter
  • Dhiraj Catoor
  • Edwin H. Chang
  • Easo P. George

Detail(s)

Original languageEnglish
Pages (from-to)1153-1158
Journal / PublicationScience
Volume345
Issue number6201
Publication statusPublished - 5 Sep 2014
Externally publishedYes

Abstract

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·m1/2. 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.

Citation Format(s)

A fracture-resistant high-entropy alloy for cryogenic applications. / Gludovatz, Bernd; Hohenwarter, Anton; Catoor, Dhiraj; Chang, Edwin H.; George, Easo P.; Ritchie, Robert O.

In: Science, Vol. 345, No. 6201, 05.09.2014, p. 1153-1158.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review