Al-Cu-Li alloys with improved cryogenic fracture toughness

Alloys or metallic compositions – Aluminum base – Copper containing

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148695, 148698, 148699, 148700, 148701, 148416, 148417, 148418, 148438, 148439, 420531, 420532, 420533, 420539, 420540, 420541, 420542, 420543, 420545, 420552, 420553, C22C 2112

Patent

active

054550033

ABSTRACT:
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.

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