Physics of defects and plasticity – PDP


Group Head: Anne Joulain (Prof.)

Staff: Valérie Audurier (Asso. Prof.), Jean-François Barbot (Prof.), Marie-France Beaufort (Research Director), Sandrine Brochard (Asso. Prof. with Habilitation), Marie-Laure David (Asso. Prof.), Alain Declémy (Research Associate), Jean-Luc Demenet (Prof.), Julien Godet (Asso. Prof.), Anne Joulain (Prof.), Bouzid Kedjar (Asso. Prof.), Laurent Pizzagalli (Research Director), Jacques Rabier (Emeritus Research Director), Ludovic Thilly (Prof.), Christophe Tromas (Asso. Prof. with Habilitation).

PhD students and Post-docs : Firas Abed El Nabi (2012->), Kevin Alix (2012->), Laurine Courtin (CEA, 2012->), Jean Rony Medy (2013->), Maxime Vallet (2011->), Wilgens Sylvain (2013->), A. Joseph (2014->).

 

The research activities of the PDP team concern structural defects, either point or extended, in materials, and their influence on macroscopic properties.  Those can be mechanical (plasticity, fragility), electrical (conductivity, semi-conductivity), magnetic properties, and they are dependent on the detailed structures of defects, their interaction and their organization. Scales of interest range from the atomic scale (fine structure of defects) to the mesoscopic scale (microstructure) and the macroscopic scale (global behaviour).

Various tools for characterizing and modelling defects, suited for these different scales, are used by researchers in the team. The non-exhaustive list includes numerical simulations (atomistic calculations, first-principles methods), imaging techniques such as transmission electronic microscopy and atomic force microscopy, detection of localized states in the electronic gap (DLTS), or the characterization with x-ray techniques.   Moreover, a significant part of our research activities focus on deformation mechanisms associated with various thermomechanical conditions, which has driven the development of original deformation techniques, allowing the use of a confining pressure for instance. 

 

Physics of dislocations and plasticity – PLASTIC

A part of our research activities aim at a better understanding of dislocations and elementary mechanisms of plasticity, in bulk materials or in nanostructures, and of the resulting properties at the macroscopic scale. The characterization and modelling of the properties of defects such as dislocations, grain boundaries, is the main focus. Investigated materials include model materials (semiconductors, oxides, metals) on the one hand, and systems with a more complex structure (MAX phases, multiphased materials and/or nanocristalline).

Defects, irradiations and induced properties – DEFI

Another part of our research topics concern defects in semiconductors. These defects are mainly created by irradiation or implantation (light ions, noble gas, electrons,...). There are various research topics, including the fundamental study of defects (formation, evolution,...), or their possible use in applications ('defect engineering'). Considered semiconductors are mainly Si, Ge, SiC and GaN.

 

National research programs led by the Group:

ANR project "BrIttle to DUctile transition in silicon at Low dimensions, BIDUL" (J. Godet, 2012-2016)

ANR project "Materials with Elementary Tailored Architecture for Functional Optimized Response: from Experiments to Simulations, METAFORES" (L. Thilly, 2012-2017)

ANR project "Stress Influence on Zirconium HYdrides Precipitation, SIZHIP" (L. pizzagalli, 2012-2016)

ANR Blanche "Fundamental study of the plasticity of recyclable Al/Al-Cu-Fe composite materials, FutureAlCo" (A. Joulain, 2013-2017)

 

Participation to other national resarch programs:

LABEX "INTERACTIFS" (C. Coupeau, 2012-2019)

ANR project "Synthesis and characterization of MAX phases single crystals, MAXICRYST" (S. Dubois, 2013-2017)








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