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US 3,944,439 AGranted
Method of preparing high fatigue strength aluminum alloy
AssigneeSwiss Aluminium Ltd.
InventorsMichael J. Pryor, James A. Ford, Sheldon W. Dean
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Abstract
The present invention consists of an aluminum alloy having a high fatigue strength which is particularly suited for use in the fabrication of printing plates for offset lithography. The alloy contains from 0.2 to 0.75% magnesium, from 0.45 to 0.7% copper, from 0.1 to 0.7% iron and up to 0.3% silicon. The alloy, when processed according to the process of the present invention possesses a uniquely high fatigue strength.
Claims6
A method of preparing a high fatigue strength aluminum alloy comprising:
- A. casting an aluminum alloy consisting essentially of from 0.2 to 0.75% magnesium, from 0.45 to 0.7% copper, from 0.1 to 0.7% iron, from 0.001 to 0.3% silicon, balance aluminum;
- B. homogenizing at a temperature of between 900.degree. and 1150.degree.F, but below the solidus temperature of the alloy, for a period of time of between 2 and 24 hours;
- C. hot rolling at a temperature of between 750.degree. and 900.degree.F;
- D. cold rolling and annealing to penultimate gage;
- E. applying a final cold reduction of at least 20%;
- and
- F. partially annealing to produce a high fatigue strength aluminum alloy.
4 more elements
Dependencies are inferred from the claim text.