Constellium Issoire

Gaelle Pouget

Armelle Danielou

Christophe Sigli

Timothy Warner

Jean-Christophe Ehrstrom

Bernard Bes

Frank Eberl

Fabrice Heymes

Christian Barthelemy

Mathieu Marquette

Jerome Pignatel

Stephane Jambu

Extrados structural element made from an aluminum, copper and lithium alloy and method for manufacturing same. An alloy with composition (in wt %) 4.2-5.2 Cu, 0.9-1.2 Li, 0.1-0.3 Ag, 0.1-0.25 Mg, 0.08-0.18 Zr, 0.01-0.15 Ti, an Fe and Si content level less than or equal to 0.1% each, and other element with content level less than or equal to 0.05% each and 0.15% in total, is poured, homogenized, deformed hot, placed in a solution at a temperature of at least 515&#xb0; C., pulled from 0.5 to 5% and annealed. The combination of magnesium, copper and manganese content with the temperature in solution can reach an advantageous elasticity under compression limit. Products having a thickness of at least 12 mm have, in the longitudinal direction, an elasticity under compression limit of at least 645 MPa and an elongation of at least 7%.

Extrados structural element made from an aluminium copper lithium alloy

The present invention relates to extruded, rolled and/or forged products. Also provided are methods of making such products based on aluminum alloy wherein a liquid metal bath is prepared comprising 2.0 to 3.5% by weight of Cu, 1.4 to 1.8% by weight of Li, 0.1 to 0.5% by weight of Ag, 0.1 to 1.0% by weight of Mg, 0.05 to 0.18% by weight of Zr, 0.2 to 0.6% by weight of Mn and at least one element selected from Cr, Sc, Hf and Ti, the quantity of said element selected, being 0.05 to 0.3% by weight for Cr and for Sc, 0.05 to 0.5% by weight for Hf and 0.01 to 0.15% by weight for Ti, the remainder being aluminum and inevitable impurities. The products and methods of the present invention offer an advantageous compromise between static mechanical strength and damage tolerance and are useful in aeronautical design.

Aluminum-copper-lithium products

An extruded product made of an alloy containing aluminum comprising 4.2 wt % to 4.8 wt % of Cu, 0.9 wt % to 1.1 wt % of Li, 0.15 wt % to 0.25 wt % of Ag, 0.2 wt % to 0.6 wt % of Mg, 0.07 wt % to 0.15 wt % of Zr, 0.2 wt % to 0.6 wt % of Mn, 0.01 wt % to 0.15 wt % of Ti, a quantity of Zn less than 0.2 wt %, a quantity of Fe and Si less than or equal to 0.1 wt % each, and unavoidable impurities with a content less than or equal to 0.05 wt % each and 0.15 wt % in total is disclosed. The profiles according to the invention are particularly useful as fuselage stiffeners or stringers, circumferential frames, wing stiffeners, floor beams or profiles, or seat tracks, notably owing to their improved properties in relation to those of known products, in particular in terms of energy absorption during an impact, static mechanical strength and corrosion resistance properties and their low density.

Aluminum-copper-lithium alloy with improved impact resistance

The disclosure provides for wrought products made of Al&#x2014;Cu&#x2014;Mg aluminum alloy composed as follows, as a percentage by weight, Cu: 2,6-3.7; Mg: 1.5-2.6, Mn: 0.2-0.5; Zr: &#x2266;0.16; Ti: 0.01-0.15; Cr&#x2266;0.25; Si&#x2266;0.2; Fe&#x2266;0.2; other elements &#x3c;0.05 the rest aluminum; with Cu&#x3e;&#x2212;0.9(Mg)+4.3 and Cu&#x3c;&#x2212;0.9(Mg)+5.0; where Cu=Cu&#x2212;0.74(Mn&#x2212;0.2)&#x2212;2.28 Fe and Mg=Mg&#x2212;1.73(Si&#x2212;0.05) for Si&#x2267;0.05 and Mg=Mg for Si&#x3c;0.05 and their manufacturing process.

High-temperature efficient aluminum copper magnesium alloys

Growing community of inventors

Grenoble, France

Gaelle Pouget