Diffusion Processes in a Migrating Interface – The Thick Interface Model

0363680 - ÚFM 2012 RIV GB eng J - Článek v odborném periodiku
Svoboda, Jiří - Gamsjäger, E. - Fischer, F. D. - Liu, Y. - Kozeschnik, E.
Diffusion Processes in a Migrating Interface – The Thick Interface Model.
Acta Materialia. Roč. 59, č. 12 (2011), s. 4775-4786. ISSN 1359-6454. E-ISSN 1873-2453
Grant CEP: GA MŠMT(CZ) OC10029
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: Modeling * Diffusion * Phase transformation * Interface migration
Kód oboru RIV: BJ - Termodynamika
Impakt faktor: 3.755, rok: 2011

During a solid/solid diffusive phase transformation from a parent b-phase to a product a-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 c/a 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.
Trvalý link: http://hdl.handle.net/11104/0199397