Entropy engineering stimulates the thermoelectric performance of FeCoNiAlSix high-entropy alloys

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-02-26 DOI:10.1016/j.materresbull.2025.113404

Cheenepalli Nagarjuna , Hansung Lee , Sheetal Kumar Dewangan , Babu Madavali , Ashutosh Sharma , Byungmin Ahn

{"title":"Entropy engineering stimulates the thermoelectric performance of FeCoNiAlSix high-entropy alloys","authors":"Cheenepalli Nagarjuna , Hansung Lee , Sheetal Kumar Dewangan , Babu Madavali , Ashutosh Sharma , Byungmin Ahn","doi":"10.1016/j.materresbull.2025.113404","DOIUrl":null,"url":null,"abstract":"<div><div>The present study explores the role of entropy engineering on thermoelectric properties of FeCoNiAlSi<em>x</em> high entropy alloys (HEAs) as a function of Si content. The addition of Si content increased mixing entropy, and reduces valance electron concentration, leading to phase transition from dual FCC+BCC phase to single BCC phase. With increasing Si content, the Seebeck coefficient increases due to a reduction in carrier concentration and an increase in effective mass. The lowest lattice thermal conductivity of 1.202 W/m∙K was obtained at 700 K for the FeCoNiAlSi<sub>0.6</sub> HEA due to strong phonon scattering induced by lattice distortion. As a result, a maximum figure of merit, <em>ZT</em> ∼ 0.016 was achieved at 700 K for the FeCoNiAlSi<sub>0.6</sub> HEA. In addition, the hardness of HEAs effectively increased from 520±10 to 740±10 HV with Si content. Therefore, entropy engineering is found to be a promising method to enhance thermoelectric and mechanical performance as well.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"188 ","pages":"Article 113404"},"PeriodicalIF":5.3000,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Research Bulletin","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0025540825001126","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

The present study explores the role of entropy engineering on thermoelectric properties of FeCoNiAlSix high entropy alloys (HEAs) as a function of Si content. The addition of Si content increased mixing entropy, and reduces valance electron concentration, leading to phase transition from dual FCC+BCC phase to single BCC phase. With increasing Si content, the Seebeck coefficient increases due to a reduction in carrier concentration and an increase in effective mass. The lowest lattice thermal conductivity of 1.202 W/m∙K was obtained at 700 K for the FeCoNiAlSi_0.6 HEA due to strong phonon scattering induced by lattice distortion. As a result, a maximum figure of merit, ZT ∼ 0.016 was achieved at 700 K for the FeCoNiAlSi_0.6 HEA. In addition, the hardness of HEAs effectively increased from 520±10 to 740±10 HV with Si content. Therefore, entropy engineering is found to be a promising method to enhance thermoelectric and mechanical performance as well.

Abstract Image

查看原文本刊更多论文

熵工程刺激feconial6高熵合金的热电性能

本研究探讨了熵工程对feconial6高熵合金（HEAs）热电性能随Si含量变化的影响。Si含量的增加增加了混合熵，降低了价电子浓度，导致双FCC+BCC相向单BCC相转变。随着Si含量的增加，由于载流子浓度的降低和有效质量的增加，Seebeck系数增大。由于晶格畸变引起的强声子散射，FeCoNiAlSi0.6 HEA在700 K时晶格热导率最低，为1.202 W/m∙K。结果，FeCoNiAlSi0.6 HEA在700 K时达到了ZT ~ 0.016的最大性能值。随着Si含量的增加，HEAs的硬度从520±10 HV有效提高到740±10 HV。因此，熵工程被认为是一种很有前途的提高热电性能和力学性能的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.