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

In this study, Ingots of (Bi, Sb)<sub>2</sub>Te<sub>3</sub> 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...

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Autores principales:	Mikhail G. Lavrentev, Vladimir T. Bublik, Filipp O. Milovich, Viktoriya P. Panchenko, Yuri N. Parkhomenko, Anatoly I. Prostomolotov, Nataliya Yu. Tabachkova, Nataliya A. Verezub, Mikhail V. Voronov, Ivan Yu. Yarkov
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	bismuth telluride hot extrusion thermoelectric material texture mathematical simulation thermoelectric figure of merit Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/232ea91122094d9d9921294681546d1c
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spelling	oai:doaj.org-article:232ea91122094d9d9921294681546d1c2021-11-25T18:16:02ZRegularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion10.3390/ma142270591996-1944https://doaj.org/article/232ea91122094d9d9921294681546d1c2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7059https://doaj.org/toc/1996-1944In this study, Ingots of (Bi, Sb)<sub>2</sub>Te<sub>3</sub> 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)<sub>2</sub>Te<sub>3</sub> 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)<sub>2</sub>Te<sub>3</sub> 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<sup>−3</sup> K<sup>−1</sup>).Mikhail G. LavrentevVladimir T. BublikFilipp O. MilovichViktoriya P. PanchenkoYuri N. ParkhomenkoAnatoly I. ProstomolotovNataliya Yu. TabachkovaNataliya A. VerezubMikhail V. VoronovIvan Yu. YarkovMDPI AGarticlebismuth telluridehot extrusionthermoelectric materialtexturemathematical simulationthermoelectric figure of meritTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7059, p 7059 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bismuth telluride hot extrusion thermoelectric material texture mathematical simulation thermoelectric figure of merit Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	bismuth telluride hot extrusion thermoelectric material texture mathematical simulation thermoelectric figure of merit Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Mikhail G. Lavrentev Vladimir T. Bublik Filipp O. Milovich Viktoriya P. Panchenko Yuri N. Parkhomenko Anatoly I. Prostomolotov Nataliya Yu. Tabachkova Nataliya A. Verezub Mikhail V. Voronov Ivan Yu. Yarkov Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion
description	In this study, Ingots of (Bi, Sb)<sub>2</sub>Te<sub>3</sub> 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)<sub>2</sub>Te<sub>3</sub> 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)<sub>2</sub>Te<sub>3</sub> 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<sup>−3</sup> K<sup>−1</sup>).
format	article
author	Mikhail G. Lavrentev Vladimir T. Bublik Filipp O. Milovich Viktoriya P. Panchenko Yuri N. Parkhomenko Anatoly I. Prostomolotov Nataliya Yu. Tabachkova Nataliya A. Verezub Mikhail V. Voronov Ivan Yu. Yarkov
author_facet	Mikhail G. Lavrentev Vladimir T. Bublik Filipp O. Milovich Viktoriya P. Panchenko Yuri N. Parkhomenko Anatoly I. Prostomolotov Nataliya Yu. Tabachkova Nataliya A. Verezub Mikhail V. Voronov Ivan Yu. Yarkov
author_sort	Mikhail G. Lavrentev
title	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_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_sort	regularities of structure formation in 30 mm rods of thermoelectric material during hot extrusion
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/232ea91122094d9d9921294681546d1c
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Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion

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