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

• Published in: Intermetallics Vol. 101; pp. 56 - 63
• Main Authors: Tapia, Antonio João Seco Ferreira, Yim, Dami, Kim, Hyoung Seop, Lee, Byeong-Joo
• Format: Journal Article
• Language: English
• Published: Barking Elsevier Ltd 01.10.2018; Elsevier BV
• Subjects: Alloy design; Alloy development; Alloy systems; Alloys; Binary systems; CALPHAD; CoFeMnNiZn; Computer simulation; Design parameters; Face-centered cubic; High entropy alloys; High-entropy alloy; Inspection; Mechanical alloying; Medical screening; Phase diagrams; Phase transitions; Solid solutions; Thermodynamics; Face-centered cubic; CALPHAD; Mechanical alloying; Alloy design; High-entropy alloy; CoFeMnNiZn
• ISSN: 0966-9795; 1879-0216
• DOI: 10.1016/j.intermet.2018.07.009

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.