Thermoelectric properties of a high entropy half-Heusler alloy processed by a fast powder metallurgy route

Karati, Anirudha and Mishra, Soumya Ranjan and Ghosh, Sanyukta and Mallik, Ramesh Chandra and Shabadi, Rajashekhara and Ramanujan, R.V. and Yadav, Satyesh Kumar and Murty, B S and et al, . (2022) Thermoelectric properties of a high entropy half-Heusler alloy processed by a fast powder metallurgy route. Journal of Alloys and Compounds, 924. pp. 1-12. ISSN 0925-8388

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Abstract

A half-Heusler (HH) type high entropy alloy (HEA) Ti2NiCoSnSb has been synthesized by a fast powder metallurgy route for the first time. Mechanical alloying (MA) by wet milling produced a powder with a minor fraction of the HH phase. The dry milling route resulted in the desired single-phase HH material. Consolidation of the nanocrystalline mechanically alloyed (MA) powder by spark plasma sintering (SPS) resulted in a majority HH phase. Interestingly, the nanocrystalline alloy exhibited simultaneous enhancement in the Seebeck coefficient and electrical conductivity, with a maximum ZT of 0.13 at 973 K observed for the dry milled alloy. The band structure obtained by density functional theory (DFT) was in good agreement with the ultraviolet-visible-near infrared (UV-Vis-NIR) absorption spectroscopy results. The DFT calculations and microstructural analysis suggest that phase separation strongly influenced the thermoelectric properties. The band structure calculations provided a good rationale for the phase evolution and thermoelectric properties. © 2022 Elsevier B.V.

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IITH Creators:

IITH Creators	ORCiD
Murty, B S	https://orcid.org/0000-0002-4399-8531

Item Type:

Article

Additional Information:

The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: R.V. Ramanujan reports financial support was provided by AME Programmatic Fund by the Agency for Science, Technology and Research, Singapore under Grant No. A1898b0043. Corresponding author B. S. Murty is serving as an editor for the Journal of Alloys and Compounds.

Uncontrolled Keywords:

Electronic band structure; Half-Heusler; High entropy alloy; Mechanical alloying; Thermoelectric material

Subjects:

Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

29 Aug 2022 14:09

Last Modified:

29 Aug 2022 14:09