Dr. Quey’s primary area of research is the mechanics and materials science associated with deformation processes of polycrystalline materials. The general aim of the research is to develop a better understanding of the deformation heterogeneities that arise at the microstructure scale. Such heterogeneities are crucial at different stage of materials’ life: when they arise during the large deformations at the elaboration stage, they drive the mechanical response and softening phenomena (recrystallization nucleation, etc.); in the final material, they drive fatigue or rupture. Dr Quey’s developments involve both experimental and numerical investigations, and the development of new theoretical concepts. Experiments are based on electron diffraction (EBSD) and high-energy X-ray diffraction at synchotrons and aims at tracking the evolution of individual grains in the bulk of the material during deformation. Simulations are carried out using the crystal plasticity finite element method or simpler micromechanical models, with a particular focus on polycrystal generation and meshing (see Neper, https://neper.info and FEPX, https://fepx.info). New concepts are drawn for the analysis of the local microstructural or mechanical states of the material. The end goal of this research is a more fundamental understanding of the relation between the microstructure of a material and the associated mechanical properties. Applications include metal forming, fatigue and rupture.

PhD (Materials Science), Mines Saint-Etienne, 2009
MSc (Materials Science), Mines Saint-Etienne, 2005
ME (Mechanics), INSA de Rouen, 2004

CNRS tenured associate scientist, Saint-Etienne, France, 2012-…
Postdoc at CEA-LETI, Grenoble, France, 2011
Postdoc at Cornell University, Ithaca (NY), USA, 2010

– R. Quey, G. Fan, Y. Zhang and D. Juul Jensen, Importance of deformation-induced local orientation distributions for nucleation of recrystallisation, Acta Materialia, 2021.
– R. Quey, A. Villani and C. Maurice, Nearly uniform sampling of crystal orientations, Journal of Applied Crystallography, 2018.
– R. Quey and L. Renversade. Optimal polyhedral description of 3D polycrystals: method and application to statistical and synchotron X-ray diffraction data. Computer Methods in Applied Mechanics and Engineering, 2018.
– M. Kasemer, R. Quey, and P. Dawson. The Influence of Mechanical Constraints Introduced by beta Annealed Microstructures on the Yield Strength and Ductility of Ti-6Al-4V. Journal of the Mechanics and Physics of Solids, 2017.
– M. Sledzinska, R. Quey, B. Mortazavi, B. Graczykowski, M. Placidi, D. Saleta Reig, D. Navarro Urrios, F. Alzina, L. Colombo, S. Roche, and C.M. Sotomayor Torres. Record Low Thermal Conductivity of Polycrystalline MoS2 films: Tuning the Thermal Conductivity by Grain Orientation. ACS Applied Material Interfaces, 2017.

Gilles Canova international award, 2021
CNRS bronze medal, 2019
Jean Mandel Award, 2015