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Early stages of spinodal decomposition in Fe-Cr resolved by in-situ small-angle neutron scattering
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2015 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 106, no 6, 061911Article in journal (Refereed) Published
Abstract [en]

In-situ, time-resolved small-angle neutron scattering (SANS) investigations of the early stages of the spinodal decomposition process in Fe-35Cr were performed at 773 and 798K. The kinetics of the decomposition, both in terms of characteristic distance and peak intensity, followed a power-law behaviour from the start of the heat treatment (a' = 0.10-0.11 and a '' = 0.67-0.86). Furthermore, the method allows tracking of the high-Q slope, which is a sensitive measure of the early stages of decomposition. Ex-situ SANS and atom probe tomography were used to verify the results from the in-situ investigations. Finally, the in-situ measurement of the evolution of the characteristic distance at 773K was compared with the predictions from the Cahn-Hilliard-Cook model, which showed good agreement with the experimental data (a' = 0.12-0.20 depending on the assumed mobility).

Place, publisher, year, edition, pages
2015. Vol. 106, no 6, 061911
Keyword [en]
Neutron scattering Atom probe tomography, Cahn hilliard cooks, Characteristic distance, In-situ investigations, In-situ measurement, Peak intensity, Power law behaviour, Time-resolved small angle neutron scattering
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-162960DOI: 10.1063/1.4908250ISI: 000349845300030ScopusID: 2-s2.0-84923917089OAI: diva2:800047

QC 20150401

Available from: 2015-04-01 Created: 2015-03-26 Last updated: 2015-04-01Bibliographically approved

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Odqvist, JoakimHedström, Peter
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