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Manipulation of σy
/κ ratio in single phase FCC solid-solutions
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We investigate how to manipulate the ratio between thermal conductivity (κ) and yield strength (σy) in face-centered cubic solid-solutions by varying the number of principal elements (NPEs) and temperature. The influence of NPEs on κ and its electronic (κe) and lattice (κl) contribution is evaluated using the Wiedemann–Franz law. Positive Δκ/ΔT and the highest κl/κe ratio in high-entropy alloys (HEAs) can be understood by considering severe lattice distortion and compositional complexity. Among the solid-solutions from Ni to quinary alloys, the NiCoFeCrMn HEA exhibits the lowest κ. However, σy increases with increasing NPEs and decreasing temperature. Thus, the NiCoFeCrMn HEA exhibits the highest σy/κ ratio, higher than those of representative cryogenic alloys, which can be distinctively increased with a decrease in temperature. These results would give us a guideline on how to manipulate properties using HEA design concept in order to develop idealized cryogenic
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