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Matériaux mésostructurés et infiltration métallique avec optimisation du squelette architecturé

Abstract : The constant search for structural lightening and performance optimization is at the origin of hybrid materials. They are defined as the combination of two (or more) materials, or the structuring of a material in a given volume, according to predetermined organization and scale in order to respond to a specific application. In addition, the recent growth of additive manufacturing offers a new unmatched design freedom. This is at the origin of hybrid materials such as lattices; it is an assembly of micro-beams ordered or not to fill a given volume. This PhD work focuses on the development of a hybrid metallic material with optimized architectured skeleton. At first, we will focus on the optimization of the skeleton. To do this, an original model generation of periodic lattices inspired by crystallography will be proposed. It will allow the generation of a database of structures to which will be added quasiperiodic lattices structures. In a second time, we will focus on the performances of these structures from the point of view of: mechanical behavior and porous network infiltration by a liquid. In both cases, phenomenological relations will be determined in order to relate the rigidity to the relative density, or the rise of an infiltration front according to the geometric characteristics of a skeleton. These relationships, via the parameters that govern them, make it possible to identify the influence of the topology and give rise to selection tools in the form of 2D maps. The X-ray tomography control steps, evaluations of the experimental mechanical properties and infiltration of porous networks make possible the confrontation with the proposed models. These different tools validate the topology and the scale of the optimized skeleton from the mechanical point of view and the infiltration. Finally, composites combining an aluminum alloy and a Ti-6Al-4V skeleton produced by selective laser melting are produced by a cold crucible, Porosity and metallurgical analysis at the Ti / Al interface will reveal the viability of the process, as well as the influence of the processing conditions on the microstructures.
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Submitted on : Monday, June 8, 2020 - 4:37:26 PM
Last modification on : Thursday, March 11, 2021 - 2:24:17 PM

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  • HAL Id : tel-02860906, version 1

Citation

Paul Lohmuller. Matériaux mésostructurés et infiltration métallique avec optimisation du squelette architecturé. Matériaux. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0311⟩. ⟨tel-02860906⟩

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