Journal
ACTA MATERIALIA
Volume 61, Issue 18, Pages 6778-6789Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.07.052
Keywords
Skutterudite; Severe plastic deformation; High pressure torsion; Nanostructures
Funding
- Austrian Science Fund (FWF) [S10403, T512-N20]
- Austrian Science Fund (FWF) [T512] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [T 512] Funding Source: researchfish
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High-pressure torsion (HPT), a severe plastic deformation technique, can effectively improve the thermoelectric performance of skutterudites, resulting in ZT values higher than for ball-milled and hot-pressed (BMHP) samples. In this paper the influence of the HPT parameters, i.e. the number of revolutions (equivalent to the applied strain), the processing temperature and the hydrostatic pressure on the microstructural and thermoelectric properties of the skutterudite DD0.60Fe3CoSb12 are evaluated and compared with the BMHP samples before HPT processing. Whilst the three parameters have specific effects on (i) the crystallite size, (ii) the density of lattice defects and (ii) the density of cracks, a suitable combination thereof allows for an increase of the figure of merit by at least 20%. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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