Objective
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
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences inorganic chemistry transition metals
- natural sciences physical sciences optics microscopy electron microscopy
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
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Coordinator
92195 Meudon
France
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