Obiettivo The first stage of this research work was focused on the choice of the main precipitation system in regard to elevated temperature properties. In this objective, tensile and creep properties at 150 C as well as fracture toughness and corrosion behaviour on rolled plates and sheets in 33 different chemical compositions/semi-products, belonging to the main precipitation systems were assessed. The stability for long exposures at 150 C of most of these alloys has been demonstrated on the basis of fine microstructural investigations and mechanical tests. From these results, it has been clearly established that the A1-2Cu-Mg-Ni system, especially the 2650 alloy, was presenting the best compromise in terms of strength, creep resistance and fracture toughness. In a second step, attempts have been made to optimise the 2 best nominal compositions (2650 & 6056), selected from task 1 on the basis of creep results, and the corresponding ageing treatment in regard to the other properties of use (fatigue, fracture toughness & corrosion). The influence of nickel, iron & manganese contents has been particularly studied on the 2650 alloy. The effort was mainly focused on fatigue, toughness and crack propagation properties but limited creep tests were also carried out to make sure that the creep behaviour was not affected by the by the alloy modifications. Lastly, the achievement of the original technical and economical objectives has been assessed through a comparison of the properties obtained on the optimised alloys with the target properties defined in the initial work programme. From this comparison, it can be clearly stated that all the original objectives of the programme are met, with the development of 2 alloys which present elevated temperature properties much improved over the best existing alloys, i.e. 2618 and 2219, together with damage tolerance properties comparable to the 2024 alloy, known as a reference in this regard. These 2 alloys are fabricated with conventional tools and do not contain any expensive constituent. This garantees that the cost objective is also attained. Besides, the 2 alloys developed do not contain any toxic element, such as nickel, which is present in the 2618 alloy. This is a very positive argument in regard to environment and recyclabilty.Multilayers (ML) are prepared by different techniques such as, evaporation under UHV conditions and sputtering. Extensive X-ray diffraction and electron microscopy studies are made in order to correlate the properties to the structure. Magnetic and magneto-optical and transport properties are also studied Campo scientifico natural scienceschemical sciencesinorganic chemistrytransition metalsnatural sciencesphysical sciencesopticsmicroscopyelectron microscopy Programma(i) FP2-BRITE/EURAM 1 - Specific research and technological development programme (EEC) in the fields of industrial manufacturing technologies and advanced materials applications (BRITE/EURAM), 1989-1992 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore Centre National de la Recherche Scientifique (CNRS) Contributo UE Nessun dato Indirizzo 1 place Aristide Briand 92195 Meudon Francia Mostra sulla mappa Costo totale Nessun dato Partecipanti (4) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Aristotelian University of Thessaloniki Grecia Contributo UE Nessun dato Indirizzo 54006 Thessaloniki Mostra sulla mappa Costo totale Nessun dato National Center for Scientific Research "Demokritos" Grecia Contributo UE Nessun dato Indirizzo Aghia Paraskevia Attikis 60228 15310 ATHINAI Mostra sulla mappa Costo totale Nessun dato Universidade do Porto Portogallo Contributo UE Nessun dato Indirizzo S/N,Rua Dr. Roberto Frias 4200 Porto Mostra sulla mappa Costo totale Nessun dato University of Bristol Regno Unito Contributo UE Nessun dato Indirizzo Senate House Tyndall Avenue BS8 1TH Bristol Mostra sulla mappa Collegamenti Sito web Opens in new window Costo totale Nessun dato