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Quantitative Evaluation of Spinodal Decomposition in Fe-Cr by Atom Probe Tomography and Radial Distribution Function Analysis

J. Zhou ; J. Odqvist ; Mattias Thuvander (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; P. Hedstrom
Microscopy and Microanalysis (1431-9276). Vol. 19 (2013), 3, p. 665-675.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: atom probe tomography (APT), spinodal decomposition, radial distribution function (RDF), phase



Denna post skapades 2013-07-01. Senast ändrad 2014-09-02.
CPL Pubid: 179541

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Teknisk fysik

Chalmers infrastruktur