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Metallurgical Research & Technology Metallurgical Research & Technology

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Residual stresses in alumina-chromium composites: micromechanical analysis and study by X-ray diffraction

Published online by Cambridge University Press:  20 January 2004

G. Geandier ,
P. Weisbecker ,
S. Denis ,
A. Hazotte ,
A. Mocellin ,
J.-L. Lebrun  and
E. Elkaim
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Abstract

In this study, we present an analysis of the internal stresses generated during cooling of alumina-chromium composites using a micromechanical approach by a finite element method. Residual stress fields are calculated for microstructural models derived from a scanning electron microscope image. Results show in particular that particles with concave shapes can generate relatively high local plastic deformation and residual stress distributions in the adjacent matrix that are very different from those of particles with a spherical shape. We present also the experimental determination of residual stresses using synchrotron radiation from LURE. We show that measurements are possible and the results concerning the mean stresses in the alumina and chromium phases are analyzed.

Type
Research Article
Information
Metallurgical Research & Technology , Volume 100 , Issue 12: Science et Génie des MatériauxContraintes résiduelles , December 2003 , pp. 1163 - 1172
Copyright
© La Revue de Métallurgie, 2003

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