A promising new class of high-temperature alloys: Eutectic high-entropy alloys
Artikel i vetenskaplig tidskrift, 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.

Författare

Y. Lu

Y. Dong

Sheng Guo

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

L. Jiang

H. Kang

T. Wang

B. Wen

Z. Wang

J. Jie

H. Ruan

T. Li

Scientific Reports

2045-2322 (ISSN)

Vol. 4 6200-

Ämneskategorier

Metallurgi och metalliska material

Den kondenserade materiens fysik

Styrkeområden

Materialvetenskap

DOI

10.1038/srep06200