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M: Metallphysik

M 33: Postersitzung

M 33.19: Poster

Donnerstag, 29. März 2001, 15:15–19:00, Foyer S4, CCH

Local and depth resolved photothermal characterization of NiTi shape memory alloys — •J. Gibkes, D. Dietzel, I. Delgadillo-Holtfort, M. Kaack, B. K. Bein, and J. Pelzl — Experimentalphysik III, Festkoerperspektroskopie, Ruhr-Universitaet Bochum, Germany

Photothermal methods based on IR radiometry, photopyroelectric detection and thermoreflectance have been applied to NiTi shape memory alloys to characterise the thermal properties of the as-prepared samples and to determine the changes of the thermal properties induced by thermal and mechanical treatment and cycling. Using photopyroelectric detection the integral diffusivity of the treated and nontreated specimens have been determined. Depth profiles of the thermal properties of the mechanically and thermally cycled ribbon samples were measured using photothermal radiometry. A photothermal microscope based on the thermal reflectance was applied to monitor the thermal properties accross the ribbon edge and to image the thermal and optical variations inside a grove which was milled into a NiTi shape memory specimen.

Work performed in the frame of the SFB 459 and GRK 384.