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NEW HIGH TEMPERATURE AL-ALLOYS DEVELOPMENT

Objective


The best aluminium alloy system with regard to elevated temperature properties (250 C to 300 C) was selected. Tensile and creep properties at temperatures up to 350 C, fracture toughness and corrosion behaviour of extruded bars in 11 alloys from the aluminium iron vanadium, aluminium iron molybdenum, aluminium chromium nickel and aluminium manganese nickel systems fabricated by hot consolidation of gas atomized powders have been studied. The stability for long exposures at temperatures up to 300 C of all these alloys has been demonstrated on the basis of fine microstructural investigations and mechanical tests. However, it has been clearly established that the aluminium iron vanadium alloys present by far the best compromise in terms of strength, creep resistance and fracture toughness.

Attempts have been made to optimize the chemical composition of the aluminium iron vanadium alloys and the fabrication process in order to maximize the compromise between mechanical properties and manufacturability. The cross effect of the iron content and the powder size distribution and the effect of magnesium additions have been studied in the case of the gas atomization process. In parallel rotating electrode, melt spinning and mechanical alloying techniques have been investigated and compared to gas atomization. This task resulted in the selection of 2 chemical compositions, aluminium iron vanadium (Al-6Fe-1.5V) and aluminium iron vanadium magnesium (Al-6Fe-1.5V-Mg) on the definition of recommendations for the manufacturing process and on the establishment of typical design properties.

Sheets and extruded bars in aluminium iron vanadium and aluminium iron vanadium magnesium have been fabricated on industrial equipment and extensively tested; the cost and technical analysis of potential applications have been carried out, confirming the strategic interest of these new materials, at least for aerospace applications, and proposals for further developments with the objectives of cost reduction and increased reliability have been made.

Coordinator

Aérospatiale Société Nationale Industrielle SA
Address
12 Rue Pasteur
92152 Suresnes
France

Participants (8)

Alenia Aeritalia & Selenia SpA
Italy
Address
Corso Marche 41
10146 Torino
Aluminium Powder Company Ltd
United Kingdom
Address
Forge Lane Minworth
B76 8AF Sutton Coldfield
British Aerospace Defence Ltd
United Kingdom
Address
Warton Aerodrome Warton
PR4 1AX Preston
Commissariat à l'Energie Atomique (CEA)
France
Address
Centre D'études De Grenoble Avenue Des Martyrs
38041 Grenoble
Consejo Superior de Investigaciones Cientificas
Spain
Address
Avenida De Gragorio Del Amo 8
28040 Madrid
IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE
United Kingdom
Address
South Kensington Campus
London
Raufoss A/S
Norway
Address
2
2831 Raufoss
Università degli Studi di Pisa
Italy
Address
Via Diotisalvi 2
56126 Pisa