Mein Praesentationsbild - Berlin, 2008.

Wissenschaftsservice - Materialforschung - Dr. Viktor Prieb

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The hysteresis loop interior
of the thermoelastic martensitic transformation


V. Prieb
"MFS-Büro Dr. Prieb"


Abstract: The hysteresis loop interior of thermoelastic martensitic transformations of TiNi-base shape memory alloys including the transformation with invariant plane is investigated in the partial transformation cycles and discussed. For the transformations with invariant plane the latent hysteresis is negligible small. The dependence of the measured heat on the martensite fraction transformed in the partial cycles is achieved and analyzed. The "invalidity" of the second rule of the thermodynamics is observed in partial cycles of the transformation with invariant plane: at the interrupt of the reverse transformation at a temperature in the interval Tpeak(heating)<T<Af the released heat of the forward transformation measured in the same partial cycle is larger as the absorbed heat of the reverse one. The stability of the two-phase system and connection between the observed energy effects and the dissipation of the elastic energy is analyzed.

More:
"Calorimetry of shape memory alloys" - collected articles (pdf-file)