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 |
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| Authors: | Elisabeth Eidenberger Erich Stergar Harald Leitner Peter Staron Jürgen Spitaler Claudia Ambrosch-Draxl and Helmut Clemens |
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| Institution: | 1.Department of Physical Metallurgy and Materials Testing,Montanuniversit?t Leoben,Leoben,Austria;2.Christian Doppler Laboratory for Early Stages of Precipitation,Montanuniversit?t Leoben,Leoben,Austria;3.Institute of Materials Research,GKSS Research Centre,Geesthacht,Germany;4.Chair of Atomistic Modelling and Design of Materials,Montanuniversit?t Leoben,Leoben,Austria;5.Materials Center Leoben Forschung GmbH,Montanuniversit?t Leoben,Leoben,Austria |
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| 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. |
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