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Analyse morphologique 3D de particules de forme complexes: application aux intermétalliques dans les alliages d'aluminium

Abstract : In this PhD-thesis, the studied material is an aluminium alloys 5182 containing two particles types: Alx(Fe,Mn) and Mg2Si. During industrial rolling, particles are broken up, and redistributed in the volume of the sheet.
As particles controls surface aspect and formability of the final sheet, the work presented is based on two issues: to highlight volume distribution of intermetallic particles, and to characterize their three-dimensional shapes during the rolling process. Thus, samples extracted to different steps of the rolling process are been scanned by X ray micro tomography (performed at the ESRF). The obtained three dimensional images are segmented by a multi class thresholding method. Extraction of each particle type is allowed. A data basis containing each individualized particles is created. It ensures to reconstruct the material binary image and also to work particle by particle.
The particles dispersion is highlight by the graph of distances and the covariance study. The analysis of linear erosion and covariance allows to model the material by a probabilistic Boolean model with spherical primary grains.
A set of morphological parameters characterizes the intermetallic particles three dimensional complex shapes. A principal components analysis is performed to sum up the information. In the obtained subspace, particles are classified into 5 families of shapes. Their evolution is followed during the rolling process.
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https://tel.archives-ouvertes.fr/tel-00164990
Contributor : Estelle Parra-Denis <>
Submitted on : Tuesday, July 24, 2007 - 2:18:45 PM
Last modification on : Monday, January 13, 2020 - 5:46:03 PM
Long-term archiving on: : Thursday, April 8, 2010 - 11:55:21 PM

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  • HAL Id : tel-00164990, version 1

Citation

Estelle Parra-Denis. Analyse morphologique 3D de particules de forme complexes: application aux intermétalliques dans les alliages d'aluminium. Mécanique [physics.med-ph]. Université Jean Monnet - Saint-Etienne, 2007. Français. ⟨tel-00164990⟩

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