Aluminum-magnesium alloys having high toughness

Details Aluminum-magnesium alloys having high toughness Aluminum-magnesium alloys having high toughness

1994-12-29

1996-10-15

Simmons, David A.

Alloys or metallic compositions

Aluminum base

Magnesium containing

75678, 148415, 148440, 420549, 420590, C22C 2106

Patent

active

055651690

ABSTRACT:
A substantially lithium-free aluminum base alloy product having improved combinations of elongation and fracture toughness in an aged condition, the aluminum alloy product comprising at least 0.5 wt. % magnesium; 0.01 to 1 ppm Na; 0.01 to 1 ppm K; less than 0.1 ppm Rb; and less than 0.1 ppm Cs, the remainder comprising aluminum, the amount of Na, K, Rb and Cs measured by GDMS, the product in an aged condition having a grain boundary region substantially free of liquid phase eutectics comprised of Na and K that form embrittlement phases at room temperature; and an increase in fracture toughness compared to an aluminum magnesium alloy having greater amounts of Na, K, Rb and Cs.

REFERENCES:
patent: 3895937 (1975-07-01), Gjosteen et al.

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