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An approach for screening single phase high-entropy alloys using an in-house thermodynamic database
Tapia, Antonio Joã,o Seco Ferreira,Yim, Dami,Kim, Hyoung Seop,Lee, Byeong-Joo Elsevier 2018 INTERMETALLICS Vol.101 No.-
<P><B>Abstract</B></P> <P>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.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel and easy to replicate screening methodology was proposed in order to guide the design of high-entropy alloys (HEAs). </LI> <LI> A criterion to evaluate the likeliness of single phase solid solution in the non-equiatomic compositional space was proposed. </LI> <LI> A criterion to identify the most relevant weaknesses for solid solution screening in a thermodynamic database was proposed. </LI> <LI> Over one hundred thousand compositions of HEAs candidate systems were analyzed; promising new HEA systems were identified. </LI> <LI> Two novel HEAs (Co<SUB>10</SUB>Fe<SUB>10</SUB>Mn<SUB>35</SUB>Ni<SUB>35</SUB>Zn<SUB>10</SUB> and Co<SUB>10</SUB>Fe<SUB>10</SUB>Mn<SUB>30</SUB>Ni<SUB>30</SUB>Zn<SUB>20</SUB>) were fabricated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
분말야금법으로 제조한 새로운 Co<sub>10</sub>Fe<sub>10</sub>Mn<sub>35</sub>Ni<sub>35</sub>Zn<sub>10</sub> 고엔트로피 합금
임다미,박형근,이병주,김형섭,Yim, Dami,Park, Hyung Keun,Tapia, Antonio Joao Seco Ferreira,Lee, Byeong-Joo,Kim, Hyoung Seop 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.3
In this paper, a new $Co_{10}Fe_{10}Mn_{35}Ni_{35}Zn_{10}$ high entropy alloy (HEA) is identified as a strong candidate for the single face-centered cubic (FCC) structure screened using the upgraded TCFE2000 thermodynamic CALPHAD database. The $Co_{10}Fe_{10}Mn_{35}Ni_{35}Zn_{10}$ HEA is fabricated using the mechanical (MA) procedure and pressure-less sintering method. The $Co_{10}Fe_{10}Mn_{35}Ni_{35}Zn_{10}$ HEA, which consists of elements with a large difference in melting point and atomic size, is successfully fabricated using powder metallurgy techniques. The MA behavior, microstructure, and mechanical properties of the $Co_{10}Fe_{10}Mn_{35}Ni_{35}Zn_{10}$ HEA are systematically studied to understand the MA behavior and develop advanced techniques for fabricating HEA products. After MA, a single FCC phase is found. After sintering at $900^{\circ}C$, the microstructure has an FCC single phase with an average grain size of $18{\mu}m$. Finally, the $Co_{10}Fe_{10}Mn_{35}Ni_{35}Zn_{10}$ HEA has a compressive yield strength of 302 MPa.