| 혼합엔트로피 제어에 따른 단일 FCC 고용체 합금의 물성변화 분석 |
| 이제인, 오현석, 김준혁, 박은수 |
| 서울대학교 재료공학부 |
| Effect of Configurational Entropy of Mixing on Thermophysical Properties in Single Phase FCC Solid Solutions with Multi-Principal Elements |
| Je In Lee, Hyun Seok Oh, Jun Hyuk Kim, Eun Soo Park |
| Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea |
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Received: 7 June 2016; Accepted: 20 July 2016. Published online: 5 January 2017. |
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| ABSTRACT |
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In the present study, we systematically investigated the effect of entropy of mixing (ΔSmix) on the mechanical and thermal properties of single phase FCC solid solutions with multi-principal elements. An increase in ΔSmix led to an increase in micro-hardness and a decrease in thermal conductivity (κ) due to severe lattice distortion. Furthermore, NiCoFeCrMn high-entropy alloy (HEA) exhibited the highest κl/κe ratio of ~1.13, because with increasing ΔSmix the reduction in lattice thermal conductivity (κl) was less than that of electron thermal conductivity (κe). In particular, a crossover in the properties’ variation was noticeable at a specific ΔSmix of ~8.3±0.3 J/mol·K, which means the properties of single phase FCC solid solutions can be optimized by modulating ΔSmix. The results can provide a guideline for manipulating the properties of single solid solutions using the HEA design concept, and help develop novel materials with optimal properties that are usable in extreme environments. |
| Keywords:
alloy design, high-entropy alloy, microstructure, mechanical property, thermal property |
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