Science· 2014Q1
A fracture-resistant high-entropy alloy for cryogenic applications
- 5,644citations
- Q1SCImago
- 2014year
Short summary
A five-element high-entropy alloy (CrMnFeCoNi) demonstrates exceptional damage tolerance and strength above 1 GPa, with fracture toughness exceeding 200 MPa·m(1/2). Its mechanical properties improve at cryogenic temperatures.
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Key points
- CrMnFeCoNi alloy exhibits tensile strength > 1 GPa and fracture toughness > 200 MPa·m(1/2).
- Mechanical properties improve at cryogenic temperatures.
- Deformation mechanism shifts from planar-slip dislocation to mechanical nanotwinning as temperature decreases.
- This transition enables continuous steady strain hardening at low temperatures.
AI-generated from the title and abstract; the full text is not read.
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·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.
The authors' abstract, as published at the source. Science, 2014 · DOI ↗
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Field: Mechanical Engineering
Mechanical EngineeringEngineering