Modelling of Diffusive and Massive Phase Transformations in Binary Systems – Thick Interface Parametric Model

0363702 - ÚFM 2012 RIV DE eng J - Journal Article
Svoboda, Jiří - Gamsjäger, E.
Modelling of Diffusive and Massive Phase Transformations in Binary Systems – Thick Interface Parametric Model.
International Journal of Materials Research. Roč. 102, č. 6 (2011), s. 666-673. ISSN 1862-5282. E-ISSN 2195-8556
R&D Projects: GA MŠMT(CZ) OC10029
Institutional research plan: CEZ:AV0Z20410507
Keywords : modelling * phase transformation * ediffusion
Subject RIV: BJ - Thermodynamics
Impact factor: 0.830, year: 2011

During a solid/solid diffusive phase transformation from a parent -phase to a product -phase dissipative processes due to diffusion in the bulk phases as well as rearrangement of the crystal lattice and diffusion in the interfacial region occur. A model has been developed that accounts for all the above mentioned dissipative processes. By means of this thick interface model it is possible to assign a finite thickness and a finite mobility to the interface. The evolution of the mole fraction profiles of the components in the bulk phases and in the interface can be simulated from a given initial state until a steady state or equilibrium is attained. Based on this theoretical framework the kinetics of the  phase transformation in the Fe-rich Fe–Cr–Ni system is simulated. Starting from a certain initial composition the transformation kinetics exhibits the features of a massive or a bulk diffusion controlled transformation depending on temperature.
Permanent Link: http://hdl.handle.net/11104/0199408