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J. Phys. IV France
Volume 05, Numéro C2, Février 1995
IIIrd European Symposium on Martensitic Transformations
Page(s) C2-423 - C2-431
IIIrd European Symposium on Martensitic Transformations

J. Phys. IV France 05 (1995) C2-423-C2-431

DOI: 10.1051/jp4:1995265

Thermodynamics of Ideal Pseudoelasticity

I. Müller

Technische Universität Berlin, Institut für Thermodynamik und Reaktionstechnik, 10623 Berlin, Germany

Experimental results are shown for CuZnAl single crystals which summarize the thermal equation of state of these alloys in the pseudoelastic temperature range, i.e. their (P,d,T)- behaviour. For a partial explanation the first and second law of thermodynamics are applied under the assumption that the essential relevant constitutive ingredients are i.) a non-convex free energy ii.) a coherency energy between the austenitic and martensitic regions. The theory predicts an unstable phase equilibrium and allows the calculation of the heat emitted during the transition. It also determines which part of the heat is reversibly emitted and which irreversibly.

© EDP Sciences 1995