Centre d’Élaboration de Matériaux et d’Etudes Structurales (UPR 8011)


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Elementary mechanisms and confined plasticity

Presentation : Crystalline defects and deformation mechanisms

At the nanoscopic scale, the mobility of the defects - mainly dislocations and interfaces - is the factor which determines the mechanical properties as a function of stress and temperature. This shows the importance of understanding the structure of defects, and their mechanisms of motion.

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Elementary mechanisms of plasticity in metals and alloys

The plastic deformation of crystalline materials is usually controlled by few elementary mechanisms, even for complex structures. For that reason, the study of elementary plasticity mechanisms is essential to understand the mechanical properties of solids.

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Small Scale plasticity

Metals with one (whiskers, fibers), two (thin films) or three (small grained materials) reduced dimensions demonstrate a clear trend that their strength scales as a
power-law of their size. The identification of elementary plastic deformation
mechanisms involved in small scale materials are not very well documented, mainly because of the difficulty to assess the dislocation activity in such
small confined areas. To that respect, in-situ TEM has rapidly appeared as the adequate experimental tool to probe these mechanisms at the pertinent length and time scales.

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Integrated circuits materials

The main application of thin metallic films is the processing of interconnects in microelectronic chips. In this research area, we study both metallic thin films and interconnects plasticity and the structural evolution in real devices.

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