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Journal of Materials Science

, Volume 29, Issue 10, pp 2663–2670 | Cite as

Non-equilibrium segregation of solutes to grain boundary

Part III Mechanism of non-equilibrium segregation
  • Sanhong Zhang
  • Xinlai He
  • T. Ko
Papers

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.

Keywords

Polymer Boron Recrystallization Theoretical Calculation Material Processing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • Sanhong Zhang
    • 1
  • Xinlai He
    • 1
  • T. Ko
    • 1
  1. 1.Department of Materials PhysicsUniversity of Science and Technology BeijingBeijingP. R. China

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