Aluminum-lithium, aluminum-magnesium and magnesium-lithium alloy

Details Aluminum-lithium, aluminum-magnesium and magnesium-lithium alloy Aluminum-lithium, aluminum-magnesium and magnesium-lithium alloy

1993-06-14

1995-06-06

Andrews, Melvyn J.

Alloys or metallic compositions

Aluminum base

Copper containing

148415, 148416, 148417, 148437, 148438, 148439, 148440, 420528, 420533, 420542, 420543, 420545, C22C 2100

Patent

active

054220661

ABSTRACT:
Aluminum-base alloys in a peak-aged condition and magnesium-base alloys in the form of cast products and wrought products capable of having improved combinations of yield strength and fracture toughness are disclosed. The aluminum-base alloy products are comprised of 0.5 to 4.5 wt %. lithium, about 0.01 to 1 ppm Na, about 0.01 to 1 ppm K, less than 0.1 ppm Rb, less than 0.1 ppm Cs, and the remainder comprising aluminum. Aluminum-base alloy products in a peak-aged condition have: (i) a grain boundary region substantially free of liquid phase eutectics comprised of Na and K that form embrittlement phases at room temperature; and (ii) an increase in fracture toughness compared to an aluminum-lithium alloy having greater than 5 ppm aggregate alkali metal.

REFERENCES:
Donald Webster, "The Effect of Low Melting Point Impurities on the Properties of Aluminum-Lithium Alloys", Metallurgical Transactions A; vol. 18A, Dec. 1987; pp. 2181-2193.

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