Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 207, Issue 10, Pages 2238-2246Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201026059
Keywords
alloys; atom probe; iron; intermetallic phases; precipitation; small-angle neutron scattering; spinodal decomposition
Funding
- European Commission [CP-CSA_INFRA-2008-1.1.1, 226507-NMI3]
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Differential scanning calorimetry (DSC) has been used to characterize the phase reactions during age hardening of a Fe-25 at% Co-9 at% Mo alloy. The heat of reaction which can be accounted for the development of the hardening phase was further analyzed on the basis of the Kissinger method and a fit based on the JMA model. Additionally, the precipitation sequence was studied by in situ small-angle neutron scattering (SANS) as well as in situ X-ray diffraction (XRD) to gain knowledge on the chemistry and crystallography of the prevailing phases. As direct imaging techniques 3D atom probe (3DAP) and high-resolution transmission electron microscopy (HRTEM) were used. The combination of these methods revealed that hardening in the investigated alloy starts with spinodally formed Mo-rich clusters followed by precipitation of the intermetallic m-phase (Fe, Co) (7)Mo(6). (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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