Formation of multiple stoichiometric phases in binary systems by combined bulk and grain boundary diffusion: Experiments and model

0383418 - ÚFM 2013 RIV GB eng J - Journal Article
Svoboda, Jiří - Fischer, F. D. - Schillinger, W.
Formation of multiple stoichiometric phases in binary systems by combined bulk and grain boundary diffusion: Experiments and model.
Acta Materialia. Roč. 61, č. 1 (2013), s. 32-39. ISSN 1359-6454. E-ISSN 1873-2453
R&D Projects: GA ČR GAP204/10/1784
Institutional support: RVO:68081723
Keywords : Bulk diffusion * Thermodynamic modeling * Intermetallic phases * Grain-boundary diffusion
Subject RIV: BJ - Thermodynamics
Impact factor: 3.940, year: 2013

The thermodynamic extremal principle has been used by the authors to treat the evolution of binary and multicomponent systems under the assumption that all phases are nearly stoichiometric. Up to now only bulk diffusion has been taken into account. The concept is now extended to combined bulk and grain boundary diffusion possible in each newly formed phase. The grains are approximated by cylinders allowing interface diffusion along the top and bottom of the grains and grain boundary diffusion along the mantle with different interface/grain boundary diffusion coefficients. A consistent analysis yields an effective diffusion coefficient taking into account the combined interface/grain boundary and bulk diffusion of each individual component. The current concept is applied to the Cu–Sn couple which has been studied by a number of researchers. The results of simulations are compared with experiments at 200 C on solid systems reported in the literature as well as with our experiments at 250 C with liquid Sn.
Permanent Link: http://hdl.handle.net/11104/0213361