A promising new class of high-temperature alloys: Eutectic high-entropy alloys
Journal article, 2014

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 AlCoCrFeNi 2.1 (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.

Author

Y. Lu

Y. Dong

Sheng Guo

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

L. Jiang

H. Kang

T. Wang

B. Wen

Z. Wang

J. Jie

H. Ruan

T. Li

Scientific Reports

2045-2322 (ISSN)

Vol. 4 6200-

Subject Categories

Metallurgy and Metallic Materials

Condensed Matter Physics

Areas of Advance

Materials Science

DOI

10.1038/srep06200

More information

Created

10/7/2017