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An approach for screening single phase high-entropy alloys using an in-house thermodynamic database

A new screening methodology is proposed to aid in the development of high-entropy alloys (HEAs). This approach takes into account three commonly used criteria and methods to guide the design of HEAs: empirical parameters, binary phase diagram inspection and the Calculation of Phase Diagrams (CALPHAD...

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Bibliographic Details
Published in:Intermetallics 2018-10, Vol.101, p.56-63
Main Authors: Tapia, Antonio João Seco Ferreira, Yim, Dami, Kim, Hyoung Seop, Lee, Byeong-Joo
Format: Article
Language:English
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Summary:A new screening methodology is proposed to aid in the development of high-entropy alloys (HEAs). This approach takes into account three commonly used criteria and methods to guide the design of HEAs: empirical parameters, binary phase diagram inspection and the Calculation of Phase Diagrams (CALPHAD) method. In addition, two novel concepts are introduced: a criterion to evaluate the likeliness of single phase solid solution in an alloy system's non-equiatomic compositional space, and a binary priority list, which allows us to make the employed in-house thermodynamic database a more reliable tool for solid solution screening in a time-effective manner. [Display omitted] •A novel and easy to replicate screening methodology was proposed in order to guide the design of high-entropy alloys (HEAs).•A criterion to evaluate the likeliness of single phase solid solution in the non-equiatomic compositional space was proposed.•A criterion to identify the most relevant weaknesses for solid solution screening in a thermodynamic database was proposed.•Over one hundred thousand compositions of HEAs candidate systems were analyzed; promising new HEA systems were identified.•Two novel HEAs (Co10Fe10Mn35Ni35Zn10 and Co10Fe10Mn30Ni30Zn20) were fabricated.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2018.07.009