Article (Scientific journals)
Modelling the influence of grain-size-dependent solute drag on the kinetics of grain growth in nanocrystalline materials
Michels, Andreas; Krill, C. E.; Ehrhardt, H. et al.
1999In Acta Materialia, 47 (7), p. 2143 - 2152
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Keywords :
Nanocrystalline materials; Grain growth; Kinetics; Theory & modeling
Abstract :
[en] The large relative change in total grain-boundary area that accompanies grain growth in a nanocrystalline material has a potentially strong influence on the kinetics of grain growth whenever grain-boundary migration is controlled by solute (impurity) drag. As the grain-boundary area decreases, the concentration of solute or impurity atoms segregated to the boundaries is expected to increase rapidly, introducing a grain-size dependence to the retarding force on boundary migration. We have modified the Burke equation—which assumes the drag force to be independent of the average grain size—to take into account a linear dependence of grain-boundary pinning on grain size. The form of the resulting grain-growth curve is surprisingly similar to Burke's solution; in fact, a constant rescaling of the boundary mobility parameter is sufficient to map one solution approximately onto the other. The activation energies for grain-boundary motion calculated from the temperature dependence of the mobility parameter are therefore identical for both models. This fact provides an explanation for the success of Burke's solution in fitting grain-growth data obtained in systems, such as nanocrystalline materials, for which the assumption of grain-size-independent solute drag is incorrect.
Disciplines :
Physics
Identifiers :
UNILU:UL-ARTICLE-2010-459
Author, co-author :
Michels, Andreas  ;  FB 10 Physik, Universität des Saarlandes, Saarbrücken, Germany
Krill, C. E.;  FB 10 Physik, Universität des Saarlandes, Saarbrücken, Germany
Ehrhardt, H.;  FB 10 Physik, Universität des Saarlandes, Saarbrücken, Germany
Birringer, R.;  FB 10 Physik, Universität des Saarlandes, Saarbrücken, Germany
Wu, D. T.;  Department of Mechanical Engineering, Yale University, New Haven, USA
Language :
English
Title :
Modelling the influence of grain-size-dependent solute drag on the kinetics of grain growth in nanocrystalline materials
Publication date :
1999
Journal title :
Acta Materialia
ISSN :
1359-6454
Publisher :
Elsevier Science
Volume :
47
Issue :
7
Pages :
2143 - 2152
Peer reviewed :
Peer Reviewed verified by ORBi
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