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A promising new class of high-temperature alloys: Eutectic high-entropy alloys

Y. Lu ; Y. Dong ; Sheng Guo (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; L. Jiang ; H. Kang ; T. Wang ; B. Wen ; Z. Wang ; J. Jie ; Z. Cao ; H. Ruan ; T. Li
Scientific Reports (2045-2322). Vol. 4 (2014), p. 6200.
[Artikel, refereegranskad vetenskaplig]

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.



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Denna post skapades 2014-10-16. Senast ändrad 2015-12-17.
CPL Pubid: 204377

 

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