Study of the Plastic Formation in the Production of Thermoelectric Material Based on Bismuth Telluride

被引：0

作者：

Bogomolov D.I. ^{[1
]}

Bublik V.T. ^{[1
]}

Verezub N.A. ^{[2
]}

Prostomolotov A.I. ^{[2
]}

Tabachkova N.Y. ^{[1
]}

机构：

[1] National University of Science and Technology MISiS, Moscow

[2] Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, Moscow

来源：

Russian Microelectronics | 2018年 / 47卷 / 8期

基金：

俄罗斯基础研究基金会;

关键词：

bismuth telluride; ECAP; grain; mathematical modeling; microscopy; plasticity; recrystallization; thermoelectricity;

D O I：

10.1134/S1063739718080048

中图分类号：

学科分类号：

摘要：

Abstract: We carry out an experimental-theoretical study of the process of the equal-channel angular pressing (ECAP) to obtain a bismuth-telluride-based thermoelectric (TE) material. A brief review of the mathematical modeling of the ECAP process is given, and the effect of the design features and temperature of ECAP regimes on the formation of plastic is studied. The results of calculations of the thermally stressed state of the samples at different stages of the ECAP process are presented. The calculations for the ECAP process are carried out using the Lagrange finite element mesh. During the calculation, the mesh is adjusted to the geometry of the die, becoming rarer or finer depending on the magnitude of the plastic deformation to satisfy the specified calculation accuracy and the convergence of the iterative process. We discuss the results of an experimental study of the structure and properties of the samples obtained with the help of ECAP using various methods (X-ray diffractometry and scanning electron microscopy). The TE characteristics of the obtained materials are measured by the Harman method. Comparative methodological calculations of the ECAP process for a bismuth-telluride-based TE material with a change in the parameters determining the formation of grains are performed (the critical plastic deformation as a function of temperature and the power-law dependence of the rate of this deformation). This allowed us to adjust the design model of the ECAP process using the grain size measurements in the TE material. The results of the calculation of the process of grain formation at different temperatures of plastic molding are presented and compared with the experimental data. The practical result of this research is the improved geometry of the die punch and the validated technological regimes of plastic deformation, which allowed obtaining samples with high TE efficiency values. © 2018, Pleiades Publishing, Ltd.

引用

页码：566 / 574

页数：8

共 21 条

[1]

Im J.-T., Grain Refinement and Texture Development of Cast BiSb Alloy via Severe Plastic Deformation, S., (2007)

[2]

Zhu W., Yang J.Y., Gao X.H., Hou J., Bao S.Q., Fan X.A., The underpotential deposition of bismuth and tellurium on cold rolled silver substrate by ECALE, Electrochim. Acta, 50, pp. 5465-5472, (2005)

[3]

Ashida M., Hamachiyo T., Hasezaki K., Matsunoshita H., Horita Z., Effect of high pressure torsion on crystal orientation to improve the thermoelectric property of a Bi 2 Te 3 -based thermoelectric semiconductor, Adv. Mater. Res., 89-91, pp. 41-46, (2010)

[4]

Ceresara S., Codecasa M., Passaretti F., Tomes F., Weidenkaff F., Fanciulli C., Thermoelectric properties of in situ formed Bi0.85Sb0.15/Bi-rich particles composite, J. Electron. Mater., 40, pp. 557-560, (2011)

[5]

Im J.-T., Hartwig K.T., Sharp J., Microstructural refinement of cast p-type Bi2Te3–Sb2Te3 by equal channel angular extrusion, Acta Mater., 52, pp. 49-55, (2004)

[6]

Kim H.S., Quang P., Seo M.H., Hong S.I., Baik K.H., Lee H., Rh., and Nghiep, D.M., Process modelling of equal channel angular pressing for ultrafine grained materials, Mater. Trans., 45, pp. 2172-2176, (2004)

[7]

Maciejewski J., Kopec H., Petryk H., Finite element analysis of strain non-uniformity in two processes of severe plastic deformation, Eng. Trans., 55, pp. 197-216, (2007)

[8]

Aour B., Mitsak A., Analysis of plastic deformation of semi-crystalline polymers during ECAE process using 135° die, J. Theor. Appl. Mech., 54, pp. 263-275, (2016)

[9]

Beyerlein I.J., Lebensohn R.A., Tome C.N., Modeling texture and microstructural evolution in the equal channel angular extrusion process, Mater. Sci. Eng. A, 345, pp. 122-138, (2003)

[10]

Parshikov R.A., Rudskoy A.I., Zolotov A.M., Tolochko O.V., Technological problems of equal channel angular pressing, Rev. Adv. Mater. Sci., 34, pp. 26-36, (2013)

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