Investigator: RNDr. Jiří Svoboda, CSc.
Number of Project: 1-2005
Agency: ASO Brno
Duration: 01. 01. 2005 - 31. 12. 2005

Massive transformations can be considered as the limitting case of diffusive phase transformations, when the diffusive processes are localized in the interface between two phases and its nearest surroundings. Thus, for the models of the massive transformation a thick interface with its internal structure and thermodynamic properties different from those of adjacent grains must be assumed. Then solute segregation and drag effects in the migrating interface take place, and these processes modify the contact conditions at the migrating interface. As a result the massive transformation can occur also in the two phase region i.e. under conditions for which the diffusive transformation is predicted by sharp interface models. In the case of diffusive phase transformation also the non-equilibrium contact conditions can exist at the migrating interface which may significantly modify the transformation kinetics. For the diffusive as well as massive transformations a uniform thick-interface model will be developed and used for simulation of kinetics of both types of transformations.

A. Orlova,K. Kucharova, A. Dlouhy,
< c >-component plastic displacements in different microstructures of TiAl-base intermetallics
Mat. Sci. Eng. A 483, (2008), p. 109

A. Dlouhy, K. Kuchařová, A. Orlová
Long-term creep and creep rupture characteristics of TiAl-base intermetallics
Mat. Sci. Eng. A 510-511,(2009), p. 350

A. Dlouhy, K. Docekalova, T. Bartak, et al.
Refractory crucible melting and related mechanical properties of Nb-containing TiAl alloys
Structural Aluminides for Elevated temperatures, (2008), p. 9

V. Sklenička, J. Dvořák, P. Král, M. Svoboda, I. Saxl
Some factors affecting the creep behaviour of metallic materials processed by equal-channel angular pressing
Int. J. Mat. Res. (formelly Z. Metallkd.) 100, (2009), p. 762

Svoboda, J., Vala, J., Gamsjäger, E., Fischer, F. D.:
A thick-interface model for diffusive and massiv phase transformation in substitutional alloys.
Acta Materialia, 54,(2006), p. 3953-3960.

Svoboda, J., Gamsjaeger, E., Fischer, F. D.:
Influence of diffusional stress relaxation on growth of stoichiometric precipitates in binary systems.
Acta Materialia, 54,(2006), p. 4575-4581

Svoboda, J., Fischer, F. D., Fratzl, P.:
Diffusion and creep in multi-component alloys with non-ideal sources and sinks for vacancies.
Acta Materialia, 54, (2006), p. 3043-3053.

Kozeschnik, E., Svoboda, J., Fischer, F. D.:
Shape factors in modeling of precipitation.
Material Science and Engineering A: Structural materials. A 441, (2006), p. 68-72.

Svoboda, J., Gamsjäger, E., Fischer, F. D.:Modelling of massive transformation in substitutional alloys. Metallurgical and Materials Transactions A, 37, 2006), p. 125-132.

Gamsjäger, E., Militzer, M., Fazeli, F., Svoboda, J., Fischer, F. D.:
Interface mobility in case of the austenite to ferrite phase transformation.
Computational Materials Science, 37, 1-2 (2006), p. 94-100.

Svoboda, J., Gamsjäger, E., Fischer, F. D., Kozeschnik, E.: Modelling of kinetics of diffusive phase transformation in binary systems with multiple stoichiometric phases.
Journal of Phase Equilibria and Diffusion, 27, 6 (2006), p. 622-628.