Al-cu-li alloys with improved cryogenic fracture toughness

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 21/12 (2006.01) B65D 25/34 (2006.01) C22C 21/00 (2006.01) C22F 1/04 (2006.01) C22F 1/057 (2006.01)

Patent

CA 2167847

A method is disclosed for the production of aluminum-copper-lithium alloys that exhibit improved strength and fracture toughness at cryogenic temperatures. Improved cryogenic properties are achieved by controlling the composition of the alloy, along with processing parameters such as the amount of cold-work and artificial aging. The ability to attain substantially equal or greater strength and fracture toughness at cryogenic temperature in comparison to room temperature allows for use of the alloys in cryogenic tanks for space launch vehicles and the like.

L'invention concerne un procédé de fabrication d'alliages d'aluminium-cuivre-lithium présentant une résistance améliorée à la fracture à des températures cryogéniques. On obtient des propriétés cryogéniques améliorées par contrôle de la composition de l'alliage, ainsi qu'au moyen de paramètres de traitement, tels que la quantité de formage à froid et de vieillissement artificiel. L'obtention d'une robustesse et d'une résistance à la fracture à température cryogénique sensiblement égales ou supérieures par rapport à la température ambiante permet d'utiliser les alliages dans des réservoirs cryogéniques pour des véhicules de lancement spatial, par exemple.

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