Phénomènes Diffusionnels et Recristallisation Accompagnant l'Assemblage de Superalliages Base Nickel par Compression à Chaud

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Phénomènes Diffusionnels et Recristallisation Accompagnant l'Assemblage de Superalliages Base Nickel par Compression à Chaud

Diffusion bonding is the prefered technique to join modern nickel based superalloys and produce hybrid aero-engine parts associating a disk type material (processed by powder metallurgy to resist low cycle fatigue at moderate temperature) and a large grain cast or directionally solidified material resisting creep. The microstructure in the vicinity of the joint, especially the γ' phase is affected by diffusion and mechanical properties are influenced by the transition from one structure to the other. The use of a ductile insert (nickel or nickel-chromium) is a solution to perform a sound bond and to manage a transition in microstructures over distances reaching 100 µm, but diffusion phenomena are amplified. Recristallisation related aspects are discussed

Recommending personalized informative contents on iTV

This paper aims to present an ongoing PhD research of the Doctoral Program Information and Communication in Digital Platforms and proposes a context aware recommender system (CARS) of informative contents about Assistance Services of General Interest for the Elderly (ASGIE) [6], for later exhibition on an Interactive TV (iTV) platform. The first phase of this research has been dedicated to assessing the information needs of seniors and designing a proper CARS data model. Future work will involve designing and implementing a prototype for further evaluation in the field with seniors, in the context of the +TV4E project [20]. In addition, it is intended to study the feasibility of leveraging the prototype over the Catchup TV service built in the UltraTV project [2]. The intended contribution of this doctoral research is to promote greater autonomy, wellbeing and info-inclusion of seniors through a personalized approach