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Title: Particle tracking during Ostwald ripening using time-resolved laboratory X-ray microtomography

Abstract

Laboratory X-ray microtomography is investigated as a method for obtaining time-resolved images of microstructural coarsening of the semisolid state of Al–5 wt.% Cu samples during Ostwald ripening. Owing to the 3D imaging capability of tomography, this technique uniquely provides access to the growth rates of individual particles, thereby not only allowing a statistical characterization of coarsening—as has long been possible by conventional metallography—but also enabling quantification of the influence of local environment on particle boundary migration. The latter information is crucial to understanding growth kinetics during Ostwald ripening at high volume fractions of the coarsening phase. Automated image processing and segmentation routines were developed to close gaps in the network of particle boundaries and to track individual particles from one annealing step to the next. The particle tracking success rate places an upper bound of only a few percent on the likelihood of segmentation errors for any given particle. The accuracy of particle size trajectories extracted from the time-resolved tomographic reconstructions is correspondingly high. Statistically averaged coarsening data and individual particle growth rates are in excellent agreement with the results of prior experimental studies and with computer simulations of Ostwald ripening. - Highlights: • Ostwald ripening in Al–5 wt.% Cumore » measured by laboratory X-ray microtomography • Time-resolved measurement of individual particle growth • Automated segmentation routines developed to close gaps in particle boundary network • Particle growth/shrinkage rates deviate from LSW model prediction.« less

Authors:
 [1];  [2];  [1]
  1. Ulm University, Institute of Micro and Nanomaterials, Albert-Einstein-Allee 47, 89081 (Germany)
  2. Ulm University, Institute of Orthopaedic Research and Biomechanics, Helmholtzstrasse 14, 89081 (Germany)
Publication Date:
OSTI Identifier:
22340354
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 90; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACCURACY; ANNEALING; COMPUTERIZED SIMULATION; IMAGE PROCESSING; MICROSTRUCTURE; PARTICLE SIZE; PARTICLE TRACKS; PARTICLES; SHRINKAGE; X RADIATION

Citation Formats

Werz, T., E-mail: thomas.werz@uni-ulm.de, Baumann, M., Wolfram, U., and Krill, C. E. Particle tracking during Ostwald ripening using time-resolved laboratory X-ray microtomography. United States: N. p., 2014. Web. doi:10.1016/J.MATCHAR.2014.01.022.
Werz, T., E-mail: thomas.werz@uni-ulm.de, Baumann, M., Wolfram, U., & Krill, C. E. Particle tracking during Ostwald ripening using time-resolved laboratory X-ray microtomography. United States. https://doi.org/10.1016/J.MATCHAR.2014.01.022
Werz, T., E-mail: thomas.werz@uni-ulm.de, Baumann, M., Wolfram, U., and Krill, C. E. 2014. "Particle tracking during Ostwald ripening using time-resolved laboratory X-ray microtomography". United States. https://doi.org/10.1016/J.MATCHAR.2014.01.022.
@article{osti_22340354,
title = {Particle tracking during Ostwald ripening using time-resolved laboratory X-ray microtomography},
author = {Werz, T., E-mail: thomas.werz@uni-ulm.de and Baumann, M. and Wolfram, U. and Krill, C. E.},
abstractNote = {Laboratory X-ray microtomography is investigated as a method for obtaining time-resolved images of microstructural coarsening of the semisolid state of Al–5 wt.% Cu samples during Ostwald ripening. Owing to the 3D imaging capability of tomography, this technique uniquely provides access to the growth rates of individual particles, thereby not only allowing a statistical characterization of coarsening—as has long been possible by conventional metallography—but also enabling quantification of the influence of local environment on particle boundary migration. The latter information is crucial to understanding growth kinetics during Ostwald ripening at high volume fractions of the coarsening phase. Automated image processing and segmentation routines were developed to close gaps in the network of particle boundaries and to track individual particles from one annealing step to the next. The particle tracking success rate places an upper bound of only a few percent on the likelihood of segmentation errors for any given particle. The accuracy of particle size trajectories extracted from the time-resolved tomographic reconstructions is correspondingly high. Statistically averaged coarsening data and individual particle growth rates are in excellent agreement with the results of prior experimental studies and with computer simulations of Ostwald ripening. - Highlights: • Ostwald ripening in Al–5 wt.% Cu measured by laboratory X-ray microtomography • Time-resolved measurement of individual particle growth • Automated segmentation routines developed to close gaps in particle boundary network • Particle growth/shrinkage rates deviate from LSW model prediction.},
doi = {10.1016/J.MATCHAR.2014.01.022},
url = {https://www.osti.gov/biblio/22340354}, journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 90,
place = {United States},
year = {Tue Apr 01 00:00:00 EDT 2014},
month = {Tue Apr 01 00:00:00 EDT 2014}
}