Quantitative Evaluation of Spinodal Decomposition in Fe-Cr by Atom Probe Tomography and Radial Distribution Function Analysis
2013 (English)In: Microscopy and Microanalysis, ISSN 1431-9276, E-ISSN 1435-8115, Vol. 19, no 3, 665-675 p.Article in journal (Refereed) Published
Nanostructure evolution during low temperature aging of three binary Fe-Cr alloys has been investigated by atom probe tomography. A new method based on radial distribution function (RDF) analysis to quantify the composition wavelength and amplitude of spinodal decomposition is proposed. Wavelengths estimated from RDF have a power-law type evolution and are in reasonable agreement with wavelengths estimated using other more conventional methods. The main advantages of the proposed method are the following: (1) Selecting a box size to generate the frequency diagram, which is known to generate bias in the evaluation of amplitude, is avoided. (2) The determination of amplitude is systematic and utilizes the wavelength evaluated first to subsequently evaluate the amplitude. (3) The RDF is capable of representing very subtle decomposition, which is not possible using frequency diagrams, and thus a proposed theoretical treatment of the experimental RDF creates the possibility to determine amplitude at very early stages of spinodal decomposition.
Place, publisher, year, edition, pages
2013. Vol. 19, no 3, 665-675 p.
atom probe tomography (APT), spinodal decomposition, radial distribution function (RDF), phase separation, stainless steels
IdentifiersURN: urn:nbn:se:kth:diva-124038DOI: 10.1017/S1431927613000470ISI: 000319126300018ScopusID: 2-s2.0-84877973197OAI: oai:DiVA.org:kth-124038DiVA: diva2:633969
FunderSwedish Research Council, 621-2009-5289Vinnova
QC 20130628. Updated from "Accepted" to "Published"2013-06-282013-06-252014-09-10Bibliographically approved