Abstract
The necessity of revision of the conventional thermodynamic scheme for martensitic transformation(MT) is presented by deducing specimen mass(size) dependence of MT chracteristics under quasi-static condition(QSC). The B2⇔B19 MT characteristics in specimens with various mass w in 49.5Ti-40Ni-10Cu-0.5Al(at%) alloy have been investigated as a function of scanning rate T through DSC measurements. With decreasing T, experimental equilibrium temperatures, To * =(Ms+Af)/2, have shifted downwards and transformation temperature intervals, Ms-Mf, have reduced. By extrapolating T dependencies of MT characteristics to T=0, the MT characteristics under infinitesimally slow T, i.e., under QSC, may be deduced. Even under QSC, the MT characteristics have shown w dependencies in To *QS and in Ms QS -Mf QS , but not in the supercooling for the onset of transformation, To *QS -Ms QS .
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