[Zurück]

G. Rogl, P. Rogl, E. Bauer, M. Zehetbauer:
"Severe Plastic Deformation, a tool to enhance thermoelectric performance";
in: "Thermoelectric Nanomaterials", 182; K. Kuomoto, T. Mori (Hrg.); Springer-Verlag, 2013, ISBN: 978-3-642-37537-8, S. 193 - 254.

High pressure torsion (HPT) is one of the methods introducing severe plastic deformation (SPD). Particularly HPT has been applied to skutterudites and has shown to be a valuable and efficient technique for grain refinement in the nanometer regime via increasing the concentration of point defects, dislocations and high-angle grain boundaries. These microstructural changes significantly enhance phonon scattering. The decrease of crystallite size causes enhanced microhardness, i.e. Hall-Petch strengthening applies. For a thermoelectric material HPT may slightly enhance the Seebeck coefficient and electrical resistivity, but significantly decreases thermal conductivity and concomitantly increases ZT. The article intends to give a comprehensive view on all data available on the influence of the various techniques of severe plastic deformation on thermoelectric materials in general.

http://dx.doi.org/10.1007/978-3-642-37537-8_10