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Ordering and Disordering in Alloys pp 79–94Cite as

Ordering Kinetics in Superalloy Type Intermetallic Compounds in Relation with Diffusion Mechanisms

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Abstract

The investigation of ordering-ordering kinetics (LRO or SRO) in inter-metallic compounds yields informations on the activation energy of the ordering process that can be compared to the energy of the interdiffusion. A systematic study of aluminide phases built either on a fcc (L12) or bcc (DO3) lattice shows that quite different behaviours are observed in the two types of structure. In L12 phases, the role played by the ordering energy has been tested in the pseudo-binary Ni3Al1-xMx (M = Fe, Mn, Cr) system which displays a strong decrease of the L12 phase stability when the transition metal M is increasingly substituted to aluminium. The activation energy (EA) of the ordering process is found to increase with the phase stability, in agreement with theoretical predictions. In binary bcc Fe1-xAlx phases, the result is different since the activation energy strongly decreases correlatively to the formation of long range ordered DO3 structure. Such an unexpected behaviour can be attributed to a large decrease of the migration energy through a lattice dynamics effect, as recently proposed in models which explain the enhanced diffusion observed in some bcc transition metals and alloys. Such a comparative experimental study shows that, depending on basic lattices, either thermodynamical or vibrational properties are determinant factors of the activation energy for the ordering kinetics.

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Authors and Affiliations

  1. Groupe d’Etude des Matériaux Métalliques, IPCMS, Université Louis Pasteur, 4 rue Blaise Pascal, 67070, Strasbourg, France

    M. C. Cadeville & V. Pierron-Bohnes

  2. Institute of Physics, Jagellonian University, Reymonta 4, 30-059, Krakow, Poland

    R. Kozubski

Authors
  1. M. C. Cadeville
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  2. V. Pierron-Bohnes
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  3. R. Kozubski
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Editor information

Editors and Affiliations

  1. Amorphous and Microcrystalline Materials Research Group, Institut National Polytechnique de Grenoble, Saint Martin d’Hères, France

    A. R. Yavari

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© 1992 Elsevier Science Publishers Ltd

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Cadeville, M.C., Pierron-Bohnes, V., Kozubski, R. (1992). Ordering Kinetics in Superalloy Type Intermetallic Compounds in Relation with Diffusion Mechanisms. In: Yavari, A.R. (eds) Ordering and Disordering in Alloys. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2886-5_8

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  • DOI: https://doi.org/10.1007/978-94-011-2886-5_8

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-1-85166-762-8

  • Online ISBN: 978-94-011-2886-5

  • eBook Packages: Springer Book Archive

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