Добірка наукової літератури з теми "Fusion d’aluminium"
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Статті в журналах з теми "Fusion d’aluminium":
GARAT, Michel. "Fusion des alliages d’aluminium." Mise en forme des métaux et fonderie, December 2012. http://dx.doi.org/10.51257/a-v2-m3635.
PERRIER, Jean-Jacques. "Fusion des alliages d’aluminium." Mise en forme des métaux et fonderie, December 2003. http://dx.doi.org/10.51257/a-v1-m3635.
Дисертації з теми "Fusion d’aluminium":
Bernardi, Cécile. "Brasage isotherme sous vide d’alliages d’aluminium pour la réalisation d’échangeurs thermiques." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0261/document.
This study deals with the vacuum TLP (Transient Liquid Phase) brazing of aluminum alloys applied to the manufacture of heat exchangers. Thus, the microstructure evolutions of 3003 (Al-Mn) and 4004 (Al-Si-Mg) alloys during the whole assembly process are studied. Firsty, model samples are heat treated in laboratory. The phase transformations and the solid state diffusion between the filler alloy and the base alloy are studied. The results are compared to thermodynamic predictions obtained with both Thermo-Calc and DICTRA softwares. We conclude that these tools are reliable at temperatures above 400°C. The fusion path of the filler alloy is described. It is shown that a Si enriched liquid is formed at the clad surface. On a second time, tests are carried out in industrial conditions, in order to take actual brazing parameters into account. Excessive dissolution and liquid penetration at grain boundaries are observed. The fine grained structure of the base alloy associated to a preferential diffusion at grain boundaries appear to be the main causes
Masiagutova, Elina. "Étude de la génération des topographies de surfaces latérales issues du procédé LPBF pour un alliage d’aluminium AlSi10Mg." Thesis, Lyon, 2022. http://www.theses.fr/2022LYSEE002.
In the current study, surface generation during additive manufacturing (AM), especially the laser powder bed fusion (LPBF) process was studied. LPBF is a progressive process that can lead to new opportunities, such as applications that require complex structures (internal channels or lightweight lattice structures). It has therefore attracted considerable attention, which has led to research and development in many industries, particularly in the aerospace industry.A surface generation study to optimize surface roughness and material density by examining the influence of the primary LPBF process parameters was therefore performed. During this study, the relationship between the roughness of the top and side surfaces and the density of the material was established. This made it possible to determine the first window of optimal parameters.An analysis of the roughness dispersion and process reproducibility were then carried out. This analysis revealed a significant roughness dispersion, especially from one side to the other. As a result, recommendations on surface measurements have been proposed.The effect of different process options (secondary parameters) are also studied in order to better understand the generation of the side surface and optimize it. This study showed that compensations and contour settings are key parameters that can help reduce the side surface roughness. Indeed, the geometric positioning of the different weld tracks is an important issue that must be addressed to reduce surface roughness. Based on the results of this study, it is possible to reduce the average surface roughness Sa from 40 to 10 μm.Finally, this thesis presents a new approach to modeling side surfaces roughness (at 0°). The approach is based on the weld track geometry (radii of curvature). It allows to take into account the weld tracks and layers position in relation to each other and thus to predict the roughness for different scanning strategies, compensation parameters
Gomez, Ortega Arturo. "Prototypage rapide de pièces en alliage d’aluminium : étude du dépôt de matière et d’énergie lors de la fusion à l’arc d’un fil par le procédé MIG-CMT." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS067/document.
A new additive manufacturing process for metallic parts, based on the arc welding process known as CMT (Cold Metal Transfer), is studied with the objective of building parts with the aluminium alloy Al5Si. A workbench for additive manufacturing based on the 3D printers open-source principle, on which the CMT generator was integrated, was specially developed. The CMT process allows to control the aluminium wire melting and its deposition under the form of droplets on the building surface, forming, after solidification, beads that can be superposed for the parts construction. The process parameters influence on the material transfer and heat transfer during the metal melting and deposition on the build surface, as well as on the geometric characteristics of the deposed beads, in the case of mono-layer deposits, and in the case of multi-layer walls, is studied. Many geometric defects were observed, and their apparition conditions analysed, thanks in particular to the use of a high-speed camera. The understanding of the relations between the process parameters, the melting and heat transfer mechanisms, and the beads geometry, allowed the defects correction by identifying and modifying the process parameters responsible of their apparition. Finally, an on-line control method for the process, based on the analysis of the voltage and current signals produced by the welding generator during the deposition phenomena, making possible the early detection of defects, and then the modification of the process parameters before they are amplified, has been proposed
Loche-Moinet, Florent. "Modélisation électrothermique pour l’analyse et l’estimation de durée de vie de modules à semi-conducteurs en court-circuit." Electronic Thesis or Diss., Bordeaux, 2023. http://www.theses.fr/2023BORD0456.
Power electronics is experiencing significant growth. Many reliability issues arise from replacing silicon with silicon carbide, particularly concerning the component’s resistance to short circuits. Currently, there are models predicting the remaining lifespan under normal component usage, but none of them address the scenario of a short circuit. However, with lifespans typically around twenty years, the modification of remaining lifespan following a short circuit is a crucial consideration for optimizing preventive or corrective maintenance.The numerical simulation of a short circuit in a power module would allow deducing the damage to the module and the corrections needed for predicting the remaining lifespan. This innovative approach faced various technological challenges and modelling issues. Firstly, as two finite element software (ANSYS Mechanicaland Sentaurus TCAD) were used, which do not naturally communicate with each other, a gateway had to be established to facilitate this connection. An electro-thermo-mechanical modelling of a 1.2 kV 15 A SiC MOSFET cell is presented in this thesis. For this numerical simulation, a surface aluminium melting model is adapted and optimized. Literature has also indicated a specific localization of short-circuit-induced degradations. To consider this localization, a multi-scale model is created, involving homogenization of the cell’s gate structure and one dimensional homogenization of the cell’s heat generation. This model comprises a microscopic part, the cell, and a macroscopic part, the chip. These efforts establish new tools for the modelling and simulation of power components during a short circuit