INFLUENCE OF PLASTIC FORMATION PARAMETERS ON STRUCTURAL CHARACTERISTICS OF THERMOELECTRIC MATERIAL DURING HOT EXTRUSION
https://doi.org/10.17073/1609-3577-2016-1-34-42
Abstract
We used mathematical modeling to compare the stress and deformation in a Bi0.4Sb1.6Te3 solid solution base thermoelectric material for extrusion through different diameter dies. The results show that extrusion through a 20 mm diameter die produces a more inhomogeneous deformation compared with extrusion through a 30 mm diameter die. Extrusion through a die of a larger diameter produces a structure that is coarser but has a more homogeneous grain size distribution. The degree of preferential grain orientation is higher for extrusion through a larger diameter die. We found a change in the lattice parameter of the solid solution along the extruded rod, correlating with detect formation during extrusion. The concentration of vacancies is higher for extrusion through a smaller diameter die. This difference between the structures results from a more intense dynamic recrystallization for a smaller diameter die. Increasing the die diameter and lowering the extrusion temperature allow retaining the thermoelectric properties of the material due to a better texture.
Supporting agencies: The work was performed with financial support from the Ministry of Education and Science of the Russian Federation (Subsidy No. RFMEFI57914X0039−14.579.21.0039) and Russian Basic Research Fund Grant (No. 15−02−01794a).
About the Authors
A. I. Prostomolotov
Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences.
Russian Federation
Russian Federation
Anatoly I. Prostomolotov — Dr. Sci. (Eng.), Leading Researcher .
101–1 Prospekt Vernadskogo, Moscow 119526.
M. V. Mezhennii
JSC Optron.
Russian Federation
Russian Federation
Mikhail V. Mezhennyi — Head of Laboratory.
53 Shcherbakovskaya Str., Moscow 105187.
N. A. Verezub
Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences.
Russian Federation
Russian Federation
Nataliya A. Verezub — Cand. Sci. (Phys.− Math.), Senior Researcher.
101–1 Prospekt Vernadskogo, Moscow 119526.
M. G. Lavrentev
JSC State Research and Design Institute of Rare Metal Industry «Giredmet».
Russian Federation
Russian Federation
Mikhail G. Lavrentev — Senior Researcher.
5–1 B. Tolmachevsky Lane, Moscow 119017.
V. B. Osvenskii
JSC State Research and Design Institute of Rare Metal Industry «Giredmet».
Russian Federation
Russian Federation
Vladimir B. Osvenskii — Head of Laboratory.
5–1 B. Tolmachevsky Lane, Moscow 119017.
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Review
For citations:
Prostomolotov A.I., Mezhennii M.V., Verezub N.A., Lavrentev M.G., Osvenskii V.B. INFLUENCE OF PLASTIC FORMATION PARAMETERS ON STRUCTURAL CHARACTERISTICS OF THERMOELECTRIC MATERIAL DURING HOT EXTRUSION. Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering. 2016;19(1):34-42. (In Russ.) https://doi.org/10.17073/1609-3577-2016-1-34-42
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