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Korean Journal of Metals and Materials > Volume 55(1); 2017 > Article
Korean Journal of Metals and Materials 2017;55(1): 1-9. doi: https://doi.org/10.3365/KJMM.2017.55.1.1
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
Correspondence  Eun Soo Park ,Tel: +82-2-880-7221, Email: espark@snu.ac.kr
Received: 7 June 2016;  Accepted: 20 July 2016.  Published online: 5 January 2017.
ABSTRACT
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 κle 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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