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Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion

In this study, Ingots of (Bi, Sb)(2)Te(3) thermoelectric material with p-type conductivity have been obtained by hot extrusion. The main regularities of hot extrusion of 30 mm rods have been analyzed with the aid of a mathematical simulation on the basis of the joint use of elastic-plastic body appr...

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Autores principales: Lavrentev, Mikhail G., Bublik, Vladimir T., Milovich, Filipp O., Panchenko, Viktoriya P., Parkhomenko, Yuri N., Prostomolotov, Anatoly I., Tabachkova, Nataliya Yu., Verezub, Nataliya A., Voronov, Mikhail V., Yarkov, Ivan Yu.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8621126/
https://www.ncbi.nlm.nih.gov/pubmed/34832459
http://dx.doi.org/10.3390/ma14227059
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author Lavrentev, Mikhail G.
Bublik, Vladimir T.
Milovich, Filipp O.
Panchenko, Viktoriya P.
Parkhomenko, Yuri N.
Prostomolotov, Anatoly I.
Tabachkova, Nataliya Yu.
Verezub, Nataliya A.
Voronov, Mikhail V.
Yarkov, Ivan Yu.
author_facet Lavrentev, Mikhail G.
Bublik, Vladimir T.
Milovich, Filipp O.
Panchenko, Viktoriya P.
Parkhomenko, Yuri N.
Prostomolotov, Anatoly I.
Tabachkova, Nataliya Yu.
Verezub, Nataliya A.
Voronov, Mikhail V.
Yarkov, Ivan Yu.
author_sort Lavrentev, Mikhail G.
collection PubMed
description In this study, Ingots of (Bi, Sb)(2)Te(3) thermoelectric material with p-type conductivity have been obtained by hot extrusion. The main regularities of hot extrusion of 30 mm rods have been analyzed with the aid of a mathematical simulation on the basis of the joint use of elastic-plastic body approximations. The phase composition, texture and microstructure of the (Bi, Sb)(2)Te(3) solid solutions have been studied using X-ray diffraction and scanning electron microscopy. The thermoelectric properties have been studied using the Harman method. We show that extrusion through a 30 mm diameter die produces a homogeneous strain. The extruded specimens exhibit a fine-grained structure and a clear axial texture in which the cleavage planes are parallel to the extrusion axis. The quantity of defects in the grains of the (Bi, Sb)(2)Te(3) thermoelectric material decreases with an increase in the extrusion rate. An increase in the extrusion temperature leads to a decrease in the Seebeck coefficient and an increase in the electrical conductivity. The specimens extruded at 450 °C and a 0.5 mm/min extrusion rate have the highest thermoelectric figure of merit (Z = 3.2 × 10(−3) K(−1)).
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spelling pubmed-86211262021-11-27 Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion Lavrentev, Mikhail G. Bublik, Vladimir T. Milovich, Filipp O. Panchenko, Viktoriya P. Parkhomenko, Yuri N. Prostomolotov, Anatoly I. Tabachkova, Nataliya Yu. Verezub, Nataliya A. Voronov, Mikhail V. Yarkov, Ivan Yu. Materials (Basel) Article In this study, Ingots of (Bi, Sb)(2)Te(3) thermoelectric material with p-type conductivity have been obtained by hot extrusion. The main regularities of hot extrusion of 30 mm rods have been analyzed with the aid of a mathematical simulation on the basis of the joint use of elastic-plastic body approximations. The phase composition, texture and microstructure of the (Bi, Sb)(2)Te(3) solid solutions have been studied using X-ray diffraction and scanning electron microscopy. The thermoelectric properties have been studied using the Harman method. We show that extrusion through a 30 mm diameter die produces a homogeneous strain. The extruded specimens exhibit a fine-grained structure and a clear axial texture in which the cleavage planes are parallel to the extrusion axis. The quantity of defects in the grains of the (Bi, Sb)(2)Te(3) thermoelectric material decreases with an increase in the extrusion rate. An increase in the extrusion temperature leads to a decrease in the Seebeck coefficient and an increase in the electrical conductivity. The specimens extruded at 450 °C and a 0.5 mm/min extrusion rate have the highest thermoelectric figure of merit (Z = 3.2 × 10(−3) K(−1)). MDPI 2021-11-21 /pmc/articles/PMC8621126/ /pubmed/34832459 http://dx.doi.org/10.3390/ma14227059 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lavrentev, Mikhail G.
Bublik, Vladimir T.
Milovich, Filipp O.
Panchenko, Viktoriya P.
Parkhomenko, Yuri N.
Prostomolotov, Anatoly I.
Tabachkova, Nataliya Yu.
Verezub, Nataliya A.
Voronov, Mikhail V.
Yarkov, Ivan Yu.
Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion
title Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion
title_full Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion
title_fullStr Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion
title_full_unstemmed Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion
title_short Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion
title_sort regularities of structure formation in 30 mm rods of thermoelectric material during hot extrusion
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8621126/
https://www.ncbi.nlm.nih.gov/pubmed/34832459
http://dx.doi.org/10.3390/ma14227059
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