Regensburg 2000 – scientific programme

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SYMT: Martensitic Transformations and Shape Memory Effect

SYMT 2: Shape Memory Effect

SYMT 2.4: Invited Talk

Wednesday, March 29, 2000, 18:00–18:30, H16

Shape Memory Thin Film Composites — •E. Quandt — Stiftung caesar, Friedensplatz 16, D-53111 Bonn, Germany

The hysteresis of thin film shape memory actuators affects the frequency of actuators switching between martensite and austenite. Therefore, the hysteresis properties of thin films of TiNi, Ti(Ni,Cu) and Ti(Ni,Pd) were investigated, which were deposited onto metallic substrates by DC-magnetron sputtering. The substrates have different expansion coefficients in order to establish biaxial tensile and compressive film stresses, respectively. The results show, that the hysteresis width is significantly affected by the stress state of the shape memory film and, in principal, depends on the temperature range of measurement whereas the difference A_f-M_f remains unchanged and is only influenced by the composition of the shape memory films.