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李亚豪,唐宇,叶益聪,李顺,万红,刘希月,朱利安,王震,白书欣.共晶高熵合金形成的热力学基础研究[J].稀有金属材料与工程(英文),2021,50(5):1635~1640.[Li Yahao,Tang Yu,Ye Yicong,Li Shun,Wan Hong,Liu Xiyue,Zhu Li’an,Wang Zhen and Bai Shuxin.Basic Thermodynamic Research of Eutectic High Entropy Alloy Formation[J].Rare Metal Materials and Engineering,2021,50(5):1635~1640.]
Basic Thermodynamic Research of Eutectic High Entropy Alloy Formation
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Received:July 04, 2020  
DOI:
Key words: eutectic high-entropy alloys  thermodynamic research  composition and structure  
Foundation item:国家自然科学基金资助(项目号51802345),湖南省自然科学基金(2019JJ40338)
Author NameAffiliation
Li Yahao,Tang Yu,Ye Yicong,Li Shun,Wan Hong,Liu Xiyue,Zhu Li’an,Wang Zhen and Bai Shuxin  
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Abstract:
      In this paper, by collecting and summarizing the reported overall composition and phase composition of 18 eutectic high-entropy alloys (EHEAs), some parameters reflecting their properties were calculated, including mixing enthalpy, mixing entropy, Gibbs free energy, atomic size mismatch, the electronegativity difference and the valence electron concentration , and the influence of these parameters on the structure of the alloy were analyzed from a thermodynamic point of view. It is found that the calculated mixed entropy equivalent of the overall composition of the eutectic high-entropy alloy basically meets the structural criterion requirements of the traditional high-entropy alloy to form a single-phase solid solution. (Such as △Smix >11 J/(mol·K)、-15 kJ/mol < △Hmix < 5 kJ/mol、δ < 6.6%) But because the average free energy of the eutectic phase is lower than the total free energy when the whole forms a single phase, this makes the eutectic high-entropy alloy in the solidification process A eutectic reaction occurs, forming a multi-phase structure.