A new strategy to design eutectic high-entropy alloys using simple mixture method

Publication date: 15 March 2018
Source:Materials & Design, Volume 142
Author(s): Hui Jiang, Kaiming Han, Xiaoxia Gao, Yiping Lu, Zhiqiang Cao, Michael C. Gao, Jeffrey A. Hawk, Tingju Li
Eutectic high entropy alloys (EHEAs) hold promising industrial application potential, but how to design EHEA compositions remains challenging. In the present work, a simple and effective strategy by combining mixing enthalpy and constituent binary eutectic compositions was proposed to design EHEA compositions. This strategy was then applied to a series of (CoCrFeNi)Mx (M = Nb, Ta, Zr, Hf) HEAs, leading to the discovery of new EHEAs, namely, CoCrFeNiNb0.45, CoCrFeNiTa0.4, CoCrFeNiZr0.55 and CoCrFeNiHf0.4. The microstructure of these new EHEAs comprised of FCC and Laves phases in the as-cast state. The experimental result shows that this new alloy design strategy can be used to locate new EHEAs effectively.

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