Memory disk sheet stock and method

US5601934A · kind A · utility

Assignee

• Aluminum Company of America · US

Inventors

• Charles W. Bartges · Delmont, US
• Stephen E. Baumann · Penn Hills, US
• Robert W. Hyland, Jr. · Oakmont, US
• Craig L. Jensen · Plum, US
• Gary P. Tarcy · Plum, US
• K. Dean Vinnedge · Bettendorf, US
• Troy C. Skeen · Bettendorf, US

Key dates

• Filing date: Jun 5, 1995
• Grant date: Feb 11, 1997
• Expiry date: Jun 5, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B5/73919
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

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.