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Microcompression tests of single-crystalline and ultrafine grain Bi2Te3 thermoelectric material

Published online by Cambridge University Press:  26 June 2015

Jon Ander Santamaría ,
Jon Alkorta  and
Javier Gil Sevillano
Jon Ander Santamaría*
Affiliation:
CEIT and TECNUN, Universidad de Navarra M. de Lardizabal, 20018 San Sebastián, Spain
Jon Alkorta
Affiliation:
CEIT and TECNUN, Universidad de Navarra M. de Lardizabal, 20018 San Sebastián, Spain
Javier Gil Sevillano
Affiliation:
CEIT and TECNUN, Universidad de Navarra M. de Lardizabal, 20018 San Sebastián, Spain
*
a)Address all correspondence to this author. e-mail: jasantamaria@ceit.es
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Abstract

Highly textured, ultrafine grain pure Bi2Te3 has been obtained by applying large-strain high-pressure torsion (HPT) to hot-pressed (HP) coarse grain material. Its thermal conductivity is significantly smaller than the conductivity of HP Bi2Te3, and its crystallographic texture and mechanical properties significantly improved. The mechanical properties of both, coarse grain and ultrafine grain, samples have been assessed by compression tests of 2 µm diameter micropillars machined by focused ion beam. The micropillars built from coarse grain samples are single crystalline, those built from ultrafine grain materials are an order of magnitude larger than their grain size. The test results put in evidence the elastic and plastic anisotropy of Bi2Te3 and the significant strengthening and toughening effect of ultrafine grain refining. For instance, after an equivalent strain of about 100, the Vickers hardness (in kg mm−2) increases from 60 to 120. Simultaneously, about a 40% reduction of the thermal conductivity has been measured, and a very strong basal texture is developed normal to the torsion axis. Such combination of properties looks very promising for simultaneously enhancing the thermoelectric figure of merit and the mechanical reliability of Bi2Te3-based alloys through HPT processing.

Keywords

texturestress/strain relationshipthermal conductivity
Type
Review
Information
Journal of Materials Research , Volume 30 , Issue 17: Focus Issue: Advances in Thermoelectric Materials II , 14 September 2015 , pp. 2593 - 2604
Copyright
Copyright © Materials Research Society 2015 

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