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Applied Physics A

, Volume 97, Issue 2, pp 331–340 | Cite as

Combined use of small-angle neutron scattering and atom probe tomography for the analysis of precipitates in a Fe-15 m% Co-25 m% Mo alloy

  • Elisabeth Eidenberger
  • Erich Stergar
  • Harald Leitner
  • Peter Staron
  • Jürgen Spitaler
  • Claudia Ambrosch-Draxl
  • Helmut Clemens
Article

Abstract

Atom probe tomography (APT) measurements were conducted to analyze nm-sized precipitates in a Fe-25 m% Co-15 m% Mo model alloy. Calculation of isoconcentration surfaces and application of cluster-search algorithms yielded the chemical compositions of matrix and precipitates. Small-angle neutron scattering (SANS) was performed in order to calculate the ratio of magnetic to nuclear scattering. This so-called A-ratio was compared with values calculated from the chemical information derived from the atom probe data. For this, the magnetism of the precipitates has to be taken into account. Ab-initio studies have been carried out to determine the magnetic moment of the precipitate phase. The results show that the extremely fine precipitates are ferromagnetic and exhibit near-equilibrium composition. In the very early stage of decomposition, however, the composition is different from near-equilibrium. The influences of the magnetism of the precipitates as well as of artifacts from atom probe measurements on the obtained results are discussed.

PACS

68.37.Vj 61.05.fg 71.20.Lp 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Elisabeth Eidenberger
    • 1
  • Erich Stergar
    • 1
  • Harald Leitner
    • 1
    • 2
  • Peter Staron
    • 3
  • Jürgen Spitaler
    • 4
    • 5
  • Claudia Ambrosch-Draxl
    • 4
  • Helmut Clemens
    • 1
  1. 1.Department of Physical Metallurgy and Materials TestingMontanuniversität LeobenLeobenAustria
  2. 2.Christian Doppler Laboratory for Early Stages of PrecipitationMontanuniversität LeobenLeobenAustria
  3. 3.Institute of Materials ResearchGKSS Research CentreGeesthachtGermany
  4. 4.Chair of Atomistic Modelling and Design of MaterialsMontanuniversität LeobenLeobenAustria
  5. 5.Materials Center Leoben Forschung GmbHMontanuniversität LeobenLeobenAustria

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