D’Souza, N., Beanland, R., Hayward, C. (Chris) and Dong, H. B. (2011) Accuracy of composition measurement using X-ray spectroscopy in precipitate-strengthened alloys : application to Ni-base superalloys. Acta Materialia, Volume 59 (Number 3). pp. 1003-1013. doi:10.1016/j.actamat.2010.10.031

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Abstract

Large scatters occur in composition measurements using wavelength-dispersive X-ray spectroscopy (WDS) when only a few precipitates are captured in the X-ray sampling volume, because the measured signal represents an averaged composition of the precipitate and the matrix phase in the sampling volume. The scatters become small when sufficient numbers of precipitates are captured and solidification segregation in the sampling volume is not significant. Monte Carlo simulations were carried out to obtain the X-ray signals from the matrix gamma and precipitated gamma' phases in as-cast Ni-base superalloys using different beam sizes for given gamma' precipitate sizes. The optimum beam size in relation to the precipitate size can be predicted for accurate composition measurements. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	X-ray spectroscopy, Nickel alloys, Heat resistant alloys, Solidification, Microstructure, Monte Carlo method
Journal or Publication Title:	Acta Materialia
Publisher:	Pergamon-Elsevier Science Ltd
ISSN:	1359-6454
Official Date:	2011
Dates:	Date Event 2011 Published
Volume:	Volume 59
Number:	Number 3
Page Range:	pp. 1003-1013
DOI:	10.1016/j.actamat.2010.10.031
Status:	Peer Reviewed
Publication Status:	Published

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