Archive 30 March 2022

Combining X-ray Tomography and Diffraction modalities to study in situ the mechanics of polycrystalline materials

Clément Ribart, Henry Proudhon

Centre des Matériaux, MINES Paristech, CNRS UMR 7633

Diffraction Contrast Tomography remains the fastest 3D grain mapping characterization method and allows further characterization of specific crystallographic locations. Coupled to in situ mechanical testing, something we have developed for a few years at CDM, it provides a unique way to probe deformation and fracture mechanisms of structural materials. Correlative experiments at higher resolution can now be performed to achieve “zoom-in” observation in selected grains. We will review several technique that can be used at the European synchrotron, such as X-ray topo-tomography, scanning 3DXRD or Dark Field X-ray Microscopy. Example to characterize plastic strain localization in metals will be presented. As the method becomes more and more automated, it allows both quantitative and statistical measurements in the bulk of the microstructure. Finally, coupling experiments with crystal plasticity finite element computations at the grain scale will be discussed as a key to unlock microstructure-deformation mechanisms.

Contact to attend the conference : Mathieu.Fevre@onera.fr

Thursday 31st Mars 2022 at 14h00

Contensou conference room, ONERA Châtillon

Scientific day in honour of François Ducastelle

 

François Ducastelle sadly passed away last summer. An outstanding physicist, François had a profound impact on the many fields he covered: the electronic structure of metals and their alloys, the statistical physics of order-disorder and phase transitions, growth modes and spectroscopic properties of low-dimensional materials. 

In his honour, the LEM organizes a scientific day which will be held on 11 July in the heart of Paris at the Ecole des Mines de Paris where he graduated and has been teaching Solid State Physics for many years. The aim of this day will be to evoke François’ career and his contribution to Condensed Matter Physics over nearly 55 years of research. Memories will be recalled through scientific presentations given by researchers specialised in the different fields François left his mark on, and testimonies by young and not-so-young researchers with whom he has been working throughout his long career, and still was.

The day will thus be a balance between scientific and memorial aspects combining past and present science, testimonies, and companionship throughout his long career as a researcher.

List of invited speakers:

You can find the preliminary program of the day on the following link.

The organising committee: Hakim Amara (LEM), Cyrille Barreteau (CEA), Alphonse Finel (LEM), Annick Loiseau (LEM) et Guy Tréglia (CINaM).

If you would like to participate, please contact Cyrille Barreteau indicating name/first name/laboratory and whether or not you would like to attend the buffet lunch. For information, a videoconference will be set up and details will be given later.

For all practical questions, please contact Catherine Deutsch.

2018, web site created by HA & RG.