Memory disk sheet stock and method

Details Memory disk sheet stock and method Memory disk sheet stock and method

1995-06-05

1997-02-11

Ryan, Patrick

Stock material or miscellaneous articles

Composite

Of inorganic material

428689, 428694R, 428694ML, 428694ST, B32B 300

Patent

active

056019343

ABSTRACT:
There is disclosed an improved memory disk stock comprised of an alloy composition which includes: about 1-11 wt. % magnesium, preferably between about 2-7 wt. % Mg; up to about 0.3 wt. % zirconium preferably about 0.02-0.25 wt. % Zr; up to about 0.2 wt. % iron, up to about 0.2 wt. % silicon, and about 0.02-0.2 wt. % of a dispersoid-forming element selected from scandium, erbium, thulium, lutetium, ytterbium, hafnium and yttrium, the balance aluminum and incidental elements and impurities. With preferably about 0.05-0.15 wt. % of scandium added to such compositions, these disk stocks exhibit significant room temperature yield strength increases over the same compositions without any scandium added.

REFERENCES:
patent: 4722872 (1988-02-01), Westerman
patent: 4751958 (1988-06-01), Flowers et al.
patent: 5211910 (1993-05-01), Pickens et al.

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