J. Phys. IV France
Volume 112, October 2003
Page(s) 341 - 344

J. Phys. IV France
112 (2003) 341
DOI: 10.1051/jp4:2003897

Relative thermodynamic stability of martensite and austenite near the room temperature

R.N. Rostovtsev

Department of Physics, Faculty of Science, Tula State University, Lenin Av. 92, Tula 300600, Russia

Chemical potentials of the components of quenched Fe-Ni alloys (28.7-32.7 at. % Ni) with martensite and austenite structures have been found with the Touch Instant Electromotive Force Method. Differences of their Gibbs energies that are a measure of relative thermodynamic stability of metastable martensite and austenite at the temperature range of 253-315 K have been calculated. The T 0* temperatures at which Gibbs energies of alloys with both types of structures are mutually equal have been determined by interpolation. The "non-chemical" contribution into Gibbs energy of the martensitic transformation has been evaluated.

© EDP Sciences 2003