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Non-equilibrium segregation of solutes to grain boundary

Part III Mechanism of non-equilibrium segregation

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Abstract

Mechanisms for the non-equilibrium segregation of solutes to static grain boundary during cooling (quenching-induced segregation) and to moving grain boundary during recrystallization (moving-induced segregation) are proposed. For quenching-induced segregation, in consideration of the local equilibrium among vacancies, solute atoms and vacancy-solute atom complexes, as well as the influence of equilibrium grain-boundary segregation, the theoretical dynamic formulae for this non-equilibrium segregation have been derived on the basis of the vacancy-dragging mechanism. Theoretical calculations have been carried out for the non-equilibrium segregation of boron to austenitic grain boundaries during isothermal holding and continuous cooling after heating at high temperature; the results agree well with those obtained from experiments. The model has also successfully explained the different behaviours of boron segregation during cooling in α-Fe and in γ-Fe. For moving-induced segregation, based on the interaction between dislocations and the moving boundaries during recrystallization, a dislocation relaxation and widening grain-boundary mechanism of solute segregation on moving boundaries is proposed. Applying this model, we have calculated the boron segregation on moving boundaries during recrystallization in Fe-3% Si alloy; the results of these calculations agree with experimental results.

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Authors and Affiliations

  1. Department of Materials Physics, University of Science and Technology Beijing, 100083, Beijing, P. R. China

    Sanhong Zhang, Xinlai He & T. Ko

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  1. Sanhong Zhang
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  2. Xinlai He
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  3. T. Ko
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Zhang, S., He, X. & Ko, T. Non-equilibrium segregation of solutes to grain boundary. JOURNAL OF MATERIALS SCIENCE 29, 2663–2670 (1994). https://doi.org/10.1007/BF00356815

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