Rolled product made of aluminum-lithium alloy for...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 21/12 (2006.01) C22F 1/057 (2006.01)

Patent

CA 2708989

The invention relates to an essentially non-recrystallized rolled product obtained from a plate less than 30 mm in thickness, comprising: 2.2 to 3.9 wt% Cu, 0.7 to 2.1 wt% Li; 0.2 to 0.8 wt% Mg; 0.2 to 0.5 wt% Mn; 0.04 to 0.18 wt% Zr; less than 0.05 wt% Zn and, optionally, 0.1 to 0.5 wt% Ag, the balance being aluminum and inevitable impurities, having a low propensity for crack bifurcation during a fatigue test along the L-S direction. The product according to the invention has a crack deviation angle T of at least 20° under an equivalent stress intensity factor Keff max 10 MPaVm for an S-L cracked test specimen subjected to a stress in mixed I and II mode, in which the angle ? between a plane perpendicular to the crack direction and the stress direction is 75°.

L'invention concerne un produit laminé essentiellement non recristallisé obtenu à partir d'une tôle d'épaisseur au moins 30 mm, comprenant 2,2 à 3,9 % en poids de Cu, 0,7 à 2,1 % en poids de Li, 0,2 à 0,8 % en poids de Mg, 0,2 à 0,5 % en poids de Mn, 0,04 à 0, 18 % en poids de Zr, moins de 0,05 % en poids de Zn, et optionnellement 0, 1 à 0,5 % en poids de Ag, reste aluminium et impuretés inévitables, présentant une faible propension à la bifurcation de fissures pendant un test en fatigue selon la direction L-S. Le produit selon l'invention présente un angle de déviation de fissure .THETA. d'au moins 20° sous un facteur d'intensité de contrainte équivalent K eff max de 10 MPa Vm pour un échantillon d'essai fissuré S-L soumis à une contrainte en mode mixte I et II, dans laquelle l'angle .PSI. entre un plan perpendiculaire à la direction de fissure et la direction de la contrainte est 75°.

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