The influence of an ordering transition on the interdiffusion in Fe-Si alloys
- Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany)
- Russian Academy of Sciences, Moscow (Russian Federation). Inst. of Solid State Physics
The concentration dependencies of the interdiffusion coefficient {tilde D} have been measured with the aid of electron probe microanalysis at seven temperatures in the concentration interval 6--16 at.% Si near the concentration C{sub ord} of the A2-B2 ordering transition. In ordered B2 phase the interdiffusion coefficient {tilde D} is about 2--3 times lower than in the disordered phase. Near the A2-B2 ordering transition {tilde D} depends strongly on the silicon concentration c. There is a maximum on every {tilde D}(c) dependence always shifted about 2--3 at.% Si to the left from C{sub ord}. Such behavior has been explained by the concentration dependence of the thermodynamic factor {Phi}. Dependencies {Phi} (c,T) have been calculated within the framework of the mean field theory (Bragg-Williams-Gorsky model), and the fluctuation contribution has been estimated using a scaling hypothesis. The calculated dependencies are in good agreement with the experimental data.
- OSTI ID:
- 100604
- Journal Information:
- Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 8 Vol. 43; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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