Processing Induced Change of Thermal Transport Properties of NiTi-Shape Memory Alloy
J. Gibkes a, B.K. Bein a, J. Pelzl a, A. Wieck a, J. Frenzel b, G. Eggeler b, I. Delgadillo-Holtfort c and M. Chirtoc d
a Institut für Experimentalphysik, Ruhr-Universität, D-44801 Bochum, Germany
b Institute for Materials Science and Engineering, Ruhr-University, D-44801 Bochum, Germany
c Instituto de Física de la Universidad de Guanajuato, IFUG, Apdo. E-143 León, Gto., Mexico
d LTP, UTAP, Université de Reims, BP 1039, 51687 Reims Cedex 2, France
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Photothermal radiometry was applied to investigate the influence of a rolling process on the thermal properties of NiTi foils. The thermal diffusivity and thermal effusivity of the foils were determined at room temperature from the frequency variation of the photothermal signals in thermal transmission. Measurements were conducted on unrolled, rolled and thermally annealed samples. The thermal diffusivity and thermal effusivity are found to decrease considerably on rolling which is attributed to the influence of the rolling induced lattice defects.
DOI: 10.12693/APhysPolA.114.A-97
PACS numbers: 62.20.Fe, 78.20.Nv, 83.50.-v