Modeling the role of sources and sinks for vacancies on the kinetics of diffusive phase transformation in binary systems with several stoichiometric phases

Abstract

The formation and growth of layers of intermetallic phases at joints of different metals is a common problem with many aspects. One of them is also the kinetics of growth of the layers. The present model based on application of the thermodynamic extremal principle accounts for the intensity of sources and sinks for vacancies in the interfaces and in the bulk. Simulations indicate that the sources and sinks influence the kinetics of the system significantly.

Keywords:

• bulk diffusion
• vacancies
• modelling
• phase transformation kinetics
• Kirkendall effect

Acknowledgments

Financial support by the Austrian Federal Government (in particular from the Bundesministerium für Verkehr, Innovation und Technologie and the Bundesministerium für Wirtschaft und Arbeit) and the Styrian Provincial Government, represented by Österreichische Forschungsförderungsgesellschaft mbH and by Steirische Wirtschaftsförderungsgesellschaft mbH, within the research activities of the K2 Competence Centre on “Integrated Research in Materials, Processing and Product Engineering”, operated by the Materials Center Leoben Forschung GmbH in the framework of the Austrian COMET Competence Centre Programme, is gratefully acknowledged. J. Svoboda acknowledges gratefully the financial support by the Czech Science Foundation in the frame of project P204/10/1784 and by the Research Plan of Institute of Physics of Materials (project CEZ:AV0Z20410507). R. Abart acknowledges funding by DFG grant AB 314/2-1 in the framework of DFG FOR741 research group.