Microstructure control and thermoelectric properties improvement to n-type bismuth telluride based materials by hot extrusion

Yang, Junyou; Chen, Rougang; Fan, Xiaoliang; Zhu, Wen; Bao, Siqian; Duan, Xingkai

doi:10.1016/j.jallcom.2006.04.030

Cited by 32 publications

(18 citation statements)

References 12 publications

(12 reference statements)

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“…After such processing, it is generally reported that in-plane components of grain basal planes are oriented along the extrusion direction, as in the UDS ingots, with the exception that extrudates demonstrate significantly higher mechanical strength along the extrusion axis than does the ingot material, a result attributable to grain refinement by dynamic recrystallization. [11][12][13][14][15][16][17][18] It is also noted in nearly all such studies that the figure of merit does not exceed that of the UDS material, a problem that may be because the compound stoichiometry is not being optimized or because of the occurrence of contamination during mechanical alloying.…”

Section: Overviewmentioning

confidence: 99%

Effect of Processing Route on the Microstructure and Thermoelectric Properties of Bismuth Telluride-Based Alloys

Gothard

Wilks

Tritt

et al. 2010

Journal of Elec Materi

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Considerable work has been done to engineer materials with high efficiencies of thermoelectric heat-to-electricity conversion and the mechanical strength necessary to withstand the demands of practical applications. In particular, in the bismuth telluride system, extrusion pressing has been found to be effective for improving the mechanical strength of alloys via grain refinement. We review some of the literature relating to processing approaches for the bismuth telluride system. We also present preliminary data for a series of samples obtained by incorporating C 60 via ball milling and spark plasma sintering into a matrix consisting of a (Bi,Sb) 2 Te 3 alloy, with a focus on the texture of the composites and its relation to thermoelectric transport properties, in comparison to the parent material. The viability of improving the thermoelectric performance of bismuth telluride alloys by the insertion of nanoparticles into a composite is also considered.

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Section: Overviewmentioning

confidence: 99%

Effect of Processing Route on the Microstructure and Thermoelectric Properties of Bismuth Telluride-Based Alloys

Gothard

Wilks

Tritt

et al. 2010

Journal of Elec Materi

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“…Физико−механические параметры выбраны со-гласно работе [5]: E = 40 ГПа -модуль Юнга, ν = 0,3 -коэффициент Пуассона. Критическое напряжение перехода из упругого в пластическое состояние при температуре ГЭ σ 0 = 102 МПа определено из установ-ленной авторами экспериментальной зависимости «напряжение-деформация».…”

Section: постановка задачиunclassified

“…По данным работы [5], коэффициент трения об-разца и фильеры f равен 0,04. В модели это трение учтено, но расчеты были проведены без его учета, так как в рассматриваемом процессе ГЭ использовали графитовую прокладку, обеспечивающую проскаль-зывание образца.…”

Section: постановка задачиunclassified

“…Для снижения этих затрат и создания теоретических основ такой технологии весьма перспективным явля-ется математическое моделирование процесса горя-чей экструзии. В отличие от ряда зарубежных работ [5,6], посвященных аналогичному моделированию и использующих известные индустриальные пакеты программ без соответствующего методического обо-снования, ниже изложен исчерпывающий методиче-ский подход и на его основе приведены практически важные результаты моделирования. В отечественной литературе публикации, аналогичные работам [5,6] и представленной ниже работе, отсутствуют.…”

Section: Introductionunclassified

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Mathematical Modeling of Extrusion Process of Thermoelectric Material

Лаврентьев

Меженный²,

Освенский

et al. 2015

Izv. vysš. učebn. zaved., Mater. èlektron. teh.

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“…3 For cost critical applications, the most economical bulk Bi 2 Te 3 alloys are typically made by directional solidification of polycrystalline ingots. For applications where efficiency is a priority, such as power generation, some manufacturers have developed bulk Bi 2 Te 3 alloys with ZT $ 1 near room temperature using conventional processing routes such as powder metallurgy, 4 extrusion, [5][6][7][8] or a combination of both. 9 ZT has essentially plateaued for Bi 2 Te 3 alloys using conventional fabrication routes, leading researchers to investigate more advanced processing techniques.…”

Section: Introductionmentioning

confidence: 99%

Friction Consolidation Processing of n-Type Bismuth-Telluride Thermoelectric Material

Whalen

Jana

Catalini

et al. 2016

Journal of Elec Materi

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Refined grain sizes and texture alignment have been shown to improve transport properties in bismuth-telluride (Bi 2 Te 3 ) based thermoelectric materials. In this work we demonstrate a new approach, called friction consolidation processing (FCP), for consolidating Bi 2 Te 3 thermoelectric powders into bulk form with a high degree of grain refinement and texture alignment. FCP is a solid-state process wherein a rotating tool is used to generate severe plastic deformation within the Bi 2 Te 3 powder, resulting in a recrystallizing flow of material. Upon cooling, the far-from-equilibrium microstructure within the flow can be retained in the material. FCP was demonstrated on n-type Bi 2 Te 3 feedstock powder having a À325 mesh size to form pucks with a diameter of 25.4 mm and thickness of 4.2 mm. Microstructural analysis confirmed that FCP can achieve highly textured bulk materials, with sub-micrometer grain size, directly from coarse feedstock powders in a single process. An average grain size of 0.8 lm was determined for regions of one sample and a multiple of uniform distribution (MUD) value of 15.49 was calculated for the (0001) pole figure of another sample. These results indicate that FCP can yield ultra-fine grains and textural alignment of the (0001) basal planes in Bi 2 Te 3 . ZT = 0.37 at 336 K was achieved for undoped stoichiometric Bi 2 Te 3 , which approximates literature values of ZT = 0.4-0.5. These results point toward the ability to fabricate bulk thermoelectric materials with refined microstructure and desirable texture using far-from-equilibrium FCP solid-state processing.

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Microstructure control and thermoelectric properties improvement to n-type bismuth telluride based materials by hot extrusion

Cited by 32 publications

References 12 publications

Effect of Processing Route on the Microstructure and Thermoelectric Properties of Bismuth Telluride-Based Alloys

Effect of Processing Route on the Microstructure and Thermoelectric Properties of Bismuth Telluride-Based Alloys

Mathematical Modeling of Extrusion Process of Thermoelectric Material

Friction Consolidation Processing of n-Type Bismuth-Telluride Thermoelectric Material

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