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The hysteresis loop interior
of the thermoelastic martensitic transformation
V. Prieb
"MFSBüro Dr. Prieb"
Abstract: The hysteresis loop
interior of thermoelastic martensitic transformations of TiNibase 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 T_{peak}(heating)<T<A_{f} 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 twophase 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 (pdffile)

