Pechiney Rhenalu

Pechiney Recherche

Societe Metallurgique De Gerzat

Pierre Sainfort

Christophe Sigli

Guy-Michel Raynaud

Jean-Francois Verdier

Ravi Shahani

Phlilippe Lassince

Timothy Warner

Denis Bechet

Jean Domeyne

Philippe Gomiero

A process for manufacturing a hollow pressure vessel, in which a billet is cast from an alloy with a composition in % by weight, Zn&equals;6.25-8.0, Mg&equals;1.2-2.2, Cu&equals;1.7-2.8, Fe<0.20, Fe&plus;Si<0.40, at least one of the elements selected from the group consisting of Cr, Zr, V, Hf and Sc in an amount of 0.05-0.3, and other elements <0.05 each and <0.15 total. The cast billet is homogenized with a temperature profile such that metal temperature is slightly less than incipient melting temperature at all times, cooled to ambient temperature and softening annealed for a duration of 20 to 40 h between 200 and 400&deg; C. with cooling at a rate of less than 50&deg; C./h down to a temperature of below 100&deg; C., resulting in a billet hardness <54 HB. A slug is cut out of the softened billet, cold or slightly warm extruded with an extrusion start temperature <300&deg; C., to form a casing which is necked, solution heat treated at a temperature slightly below the incipient melting temperature, for a duration sufficient to obtain an absolute value of specific energy associated with a DTA thermogram signal of less than 3 J/g, quenched in cold water, and aged at between 100 and 200&deg; C. for a duration between 5 and 25 h.

Manufacturing process for a hollow pressure vessel made of AlZnMgCu alloy

Thick alznmgcu alloy products with improved properties

A rolled, forged or extruded AlZnMgCu alloy product, used to manufacture structural elements for aircraft, particularly wing spars. The product is greater than 60 mm thick, and has a composition (% by weight):

Thick alZnMgCu alloy products with improved properties

Aluminum-silicon alloy sheet for use in mechanical, aircraft and

An improvement to a process for treating an aluminum alloy for the series AA 2000 or AA 6000 comprising solution heat treating, quenching and natural or artificial aging, in which conventional heat solution heat treating is defined as solution heat treating the alloy at a temperature which is 5.degree. to 10.degree. C. below a known eutectics melting temperature for the alloy. The improvement comprises solution heat treating at a temperature which is 10.degree. to 100.degree. C. below the conventional solution heat treating temperature in order to desensitize the alloy to intercrystalline corrosion.

Process for the desensitisation to intercrystalline corrosion of 2000

AA 7000 series alloys having high mechanical strength and a process for obtaining them. The alloys contain, by weight, 7 to 13.5% Zn, 1 to 3.8% Mg, 0.6 to 2.7% Cu, 0 to 0.5% Mn, 0 to 0.4% Cr, 0 to 0.2% Zr, others up to 0.05% each and 0.15% total, and remainder Al. Either wrought or cast alloys can be obtained, and the specific energy associated with the DEA melting signal of the product is lower than 3 J/g.

7000 Alloy having high mechanical strength and a process for obtaining it

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Grenoble, France

Pierre Sainfort