Maxime Dupraz

I am a postdoctoral researcher, currently working at the CEA Grenoble, in the framework of the EU-funded ERC project CARINE. In parallel, I am also a visiting postdoc on the microdiffraction imaging ID01 beamline of the ESRF.

Since the beginning of my PhD in 2012, I have been trying to understand the interplay between the microstructure and physical properties of a large range metallic samples. To do so, I am relying predominantly on two tools: synchrotron X-ray diffraction techniques (45 synchrotron beamtimes in the past 9 years) coupled with in situ and operando environments and large-scale Molecular Dynamics simulations. My current research activities rely on this combined experimental/modeling approach to investigate in situ and operando the structural evolution of catalytic nanoparticles during reaction. My expertise in synchrotron techniques and in particular Bragg Coherent Diffraction Imaging CDI is an important asset to the project. In addition, coupling BCDI with atomistic simulations is particularly efficient to understand the role of strain and defects in improving the catalytic activity.

Email / CV / Google Scholar / Twitter / Github

Research

	A convolutional neural network for defect classiﬁcation in Bragg coherent X-ray diffraction Bruce Lim, Ewen Bellec, Maxime Dupraz, Steven J. Leake, Andrea Resta, Alessandro Coati, Michael Sprung, Ehud Almog, Eugen Rabkin, Tobias Schulli and Marie-Ingrid Richard co first-authors npj computational materials 7, 2021 arXiv In this work, we exploit a computational tool based on a three-dimensional (3D) parametric atomistic model and a convolutional neural network to predict dislocations in a crystal from its 3D coherent diffraction pattern.
	Deciphering the interactions between single arm dislocation sources and coherent twin boundary in nickel bi-crystal Vahid Samaee, Maxime Dupraz, Thomas Pardoen, Helena Van Swygenhoven, Dominique Schryvers and Hosni Idrissi Nature Communications 12, 2021 We reveal new interactions mechanisms between screw dislocations and a Σ3 Coherent Twin Boundary in a sub-micron Ni bi-crystal using in situ Transmission Electron Microscopy and atomistic simulations
	Bragg coherent imaging of nanoprecipitates: role of superstructure reflections Maxime Dupraz, Steven J. Leake, Marie-Ingrid Richard Journal of Applied Crystallography 53, 2021 arXiv / HAL We carry out a detailed numerical analysis which demonstrates the relevance of BCDI for the imaging of coherent precipitates and more generally ordered phases
	Continuous scanning for Bragg coherent X‑ray imaging Ni Li, Maxime Dupraz, Longfei Wu, Steven J. Leake, Andrea Resta, Jérôme Carnis, Stéphane Labat, Ehud Almog, Eugen Rabkin, Vincent Favre-Nicolin, Frédéric-Emmanuel Picca, Felisa Berenguer, Rim van de Poll, Jan P. Hofmann, Alina Vlad, Olivier Thomas, Yves Garreau, Alessandro Coati and Marie-Ingrid Richard Scientific Reports 10, 2020 HAL We explore the use of continuous scanning during data acquisition for Bragg coherent diffraction imaging , i.e., where the sample is in continuous motion.
	Response surface for screw dislocation: Twin boundary interactions in FCC metals Satish I. Rao, Maxime Dupraz, Chris Woodward, Triplicane A. Parthasarathy Acta Materialia 195, 2020 We present an analytic mechanistic model that reproduces accurately atomistic simulations results for the transmission mechanisms and critical transmission stress of a screw dislocation across Σ3 coherent twin boundary in Al, Ni and Cu.
	Large scale 3-dimensional atomistic simulations of screw dislocations interacting with coherent twin boundaries in Al, Cu and Ni under uniaxial and multiaxial loading conditions Maxime Dupraz, Satish I. Rao, Helena Van Swygenhoven Acta Materialia 174, 2019 We use large scale 3D atomistic simulations to study the influence of multiaxial stresses on the interaction between a curved dislocation and a Σ3 coherent twin boundary in Al, Ni and Cu.
	Dislocation interactions at reduced strain rates in atomistic simulations of nanocrystalline Al. Maxime Dupraz, Zhen Sun, Christian Brandl, Helena Van Swygenhoven Acta Materialia 144, 2018 We carry out Molecular dynamics simulations of transient stress drops in different regimes on a nanocrystalline Aluminium sample. We reveal new deformation mechanisms associated to the low strain rate of the simulation
	3D Imaging of a Dislocation Loop at the Onset of Plasticity in an Indented Nanocrystal. Maxime Dupraz, Guillaume Beutier, Thomas W. Cornelius, Guillaume Parry, Zhe Ren, Stéphane Labat, Marie-Ingrid Richard, Gilbert A. CHahine, Oleg Kovalenko, Marc De Boissieu, Eugen Rabkin, Marc Verdier and Olivier Thomas Nano Letters 17, 2017 HAL We use Bragg Coherent Diffraction Imaging to reveal in 3D the evolution of the microstructure of a nanocrystal exosed to in situ mechanical loading.
	Identifying Defects with Guided Algorithms in Bragg Coherent Diffractive Imaging. Andrew Ulvestad, Youssef Nashed, Guillaume Beutier, Marc Verdier, Stephan O. Hruszkewycz and Maxime Dupraz Scientific Reports 7, 2017 We use numerical simulations to explore different guided phase retrieval algorithms for imaging defective crystals using BCDI
	A Miniaturized Biaxial Deformation Rig for in Situ Mechanical Testing. Steven Van Petegem, Antoine Guitton, Maxime Dupraz, Alex Bollhalder, Karl Sofinowski, Manas V. Upadhyay and H. Van Swygenhoven Experimental Mechanics 7, 2017 HAL We present a novel miniaturized biaxial deformation rig which allows to apply in-plane biaxial stress states and to perform strain path changes on thin-sheet materials
	Wetting layer of copper on the tantalum (001) surface. Maxime Dupraz, Roberta Poloni, Kitti Ratter, David Rodney, Maurizio De Santis, Bruno Gilles, Guillaume Beutier and Marc Verdier Physical Review B 7, 2016 HAL We combine Surface X-ray Diffraction measurements and Density Functional Theory Calculation to reveal the structure of the Cu-Ta(0 0 1) interface.
	Signature of dislocations and stacking faults of face-centred cubic nanocrystals in coherent X-ray diffraction patterns: a numerical study. Maxime Dupraz, Guillaume Beutier, David Rodney, Dan Mordehai and Marc Verdier Journal of Applied Crystallography 48, 2015 HAL We carry out a detailed numerical analysis to reveal the signature of individual crystal defects in Coherent X-ray Diffraction Patterns in the vicinity of allowed Bragg reflections.
	Inversion Domain Boundaries in GaN Wires Revealed by Coherent Bragg Imaging. Stéphane Labat, Marie-Ingrid Richard, Maxime Dupraz, Marc Gailhanou, Guillaume Beutier, Marc Verdier, Francesca Mastropietro, Thomas W. Cornelius, Tobias U. Schülli, Joël Eymery, and Olivier Thomas ACS Nano 9, 2015 HAL We reveal the microscopic conﬁguration of Inversion Domain Boundaries inside n-doped gallium nitride wires by Bragg Coherent Diffraction imaging.
	Holographic imaging of interlayer coupling in Co/Pt/NiFe. Thomas A. Duckworth, Feodor Y. Ogrin, Guillaume Beutier, Sarnjeet S Dhesi, Stuart A Cavill, Sean Langridge, Amy Whiteside, Thomas Moore, Maxime Dupraz, Flora Yakhou New Journal of Physics 15, 2013 HAL We present a method to determine the magnetic configuration of an in-plane magnetized permalloy layer using Fourier transform holography with extended references in an off-normal geometry.

Design and source code from Jon Barron's website and Leonid Keselman's Jekyll fork.