Article (Scientific journals)
Unraveling the nature of room temperature grain growth in nanocrystalline materials
Ames, M.; Markmann, J.; Karos, R. et al.
2008In Acta Materialia, 56, p. 4255-4266
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Keywords :
Grain growth; Nanocrystalline materials; X-ray diffraction (XRD)
Abstract :
[en] We report on the observation of real-time-resolved room temperature grain growth in nanocrystalline metals. We find that neither the time evolution of size can be modeled by standard growth theories nor are there any other systems aware to us that manifest a similar growth behaviour. We detect a transition from an initially self-similar slow growth to abnormal grain growth. Its onset seems to be associated with the simultaneous decrease of microstrain with increasing grain size. Abnormal grain growth is considered as a generic feature of nanocrystallinity but is a transient state since we observed in the late stage of coarsening, using orientational imaging microscopy, a monomodal grain size distribution. We empirically find a nonlinear-response-type of growth law which is in agreement with the observed coarsening kinetics.
Disciplines :
Physics
Identifiers :
UNILU:UL-ARTICLE-2010-483
Author, co-author :
Ames, M.;  Technische Physik, Universität des Saarlandes, Germany
Markmann, J.;  Technische Physik, Universität des Saarlandes, Germany
Karos, R.;  INM–Leibniz-Institut für Neue Materialien GmbH, Germany
Michels, Andreas  ;  Technische Physik, Universität des Saarlandes, Germany
Tschöpe, A.;  Technische Physik, Universität des Saarlandes, Germany
Birringer, R.;  Technische Physik, Universität des Saarlandes, Germany
Language :
English
Title :
Unraveling the nature of room temperature grain growth in nanocrystalline materials
Publication date :
2008
Journal title :
Acta Materialia
ISSN :
1359-6454
Publisher :
Elsevier Science
Volume :
56
Pages :
4255-4266
Peer reviewed :
Peer Reviewed verified by ORBi
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since 23 April 2013

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