Thermoelectric properties of half-Heusler high-entropy Ti2NiCoSn1-xSb1+x (x=0.5, 1) alloys with VEC> 18

SCRIPTA MATERIALIA

卷:186

Article

Karati, Anirudha¹  Hariharan, V. S.²  Ghosh, Sanyukta³  Prasad, Anil⁴  Nagini, M.²  Guruvidyathri, K.⁵  Mallik, Ramesh Chandra³  Shabadi, Rajashekhara⁶  Bichler, Lukas⁴  Murty, B. S.²  Varadaraju, U. V.¹ 

[1] Indian Inst Technol Madras, Dept Chem, Dept Met & Mat Engn, Chennai, Tamil Nadu, India

[2] Indian Inst Technol Madras, Dept Met & Mat Engn, Chennai 600036, Tamil Nadu, India

[3] Indian Inst Sci, Dept Phys, Thermoelect Mat & Devices Lab, Bangalore, Karnataka, India

[4] Univ British Columbia Okanagan, Sch Engn, Kelowna, BC, Canada

[5] Univ Hyderabad, Sch Engn Sci & Technol, Hyderabad, India

[6] Univ Lille, CNRS, INRAE, Cent Lille,UMR 8207 UMET Unite Mat & Transformat, F-59000 Lille, France

关键词: Heusler phases;    Intermetallic compounds;    Thermoelectric materials;    Spark plasma sintering;    Atom probe tomography;   

DOI  :  10.1016/j.scriptamat.2020.04.036

来源: Elsevier

【 摘 要 】

A new set of half-Heusler high-entropy alloys Ti2NiCoSn1-xSb1+x (x = 0.5, 1), with a valence electron count higher than 18, were investigated for thermoelectric applications. Vacuum arc melting was employed for synthesis. Atom probe analysis confirmed single-phase at atomic level. The alloys were subsequently ball milled for 1 h followed by spark plasma sintering for consolidation. In 1 h BM cases, the alloy with x = 0.5 exhibited a low lattice thermal conductivity of 2.48 Wm(-1)K(-1), and a ZT of 0.29 at 873 K. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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