Scientific Reports· 2014Q1
A Promising New Class of High-Temperature Alloys: Eutectic High-Entropy Alloys
- 1,697citations
- Q1SCImago
- 2014year
Short summary
A novel eutectic high-entropy alloy (EHEA) design strategy yields an AlCoCrFeNi2.1 alloy with unprecedented room-temperature ductility and fracture strength, maintained up to 700°C.
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Key points
- A new eutectic alloy concept was used to design high-entropy alloys (HEAs).
- The designed AlCoCrFeNi2.1 EHEA has a fine lamellar fcc/B2 microstructure.
- This EHEA shows unprecedented high tensile ductility and fracture strength at room temperature.
- Excellent mechanical properties are retained up to 700°C.
- The design strategy is adaptable for large-scale industrial production.
AI-generated from the title and abstract; the full text is not read.
Abstract
High-entropy alloys (HEAs) can have either high strength or high ductility, and a simultaneous achievement of both still constitutes a tough challenge. The inferior castability and compositional segregation of HEAs are also obstacles for their technological applications. To tackle these problems, here we proposed a novel strategy to design HEAs using the eutectic alloy concept, i.e. to achieve a microstructure composed of alternating soft fcc and hard bcc phases. As a manifestation of this concept, an AlCoCrFeNi2.1 (atomic portion) eutectic high-entropy alloy (EHEA) was designed. The as-cast EHEA possessed a fine lamellar fcc/B2 microstructure, and showed an unprecedented combination of high tensile ductility and high fracture strength at room temperature. The excellent mechanical properties could be kept up to 700°C. This new alloy design strategy can be readily adapted to large-scale industrial production of HEAs with simultaneous high fracture strength and high ductility.
The authors' abstract, as published at the source. Scientific Reports, 2014 · DOI ↗
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Field: Mechanical Engineering
Mechanical EngineeringEngineering