Granted Patent B2

US 6,869,490 · App. 10/000,147 · Granted Mar 22, 2005

Abstract

Claims (20)

1. A process for thermally treating an article made from an alloy comprising at least aluminum, copper, lithium and silver, the process comprising:

solid solution heat treating the article for a time period and a temperature sufficient to allow substantially all soluble alloy components to enter into the solution and embed the aluminum alloy components in a generally uniform manner throughout the article;

quenching the article;

heating the article to a first temperature of from about 275 to about 340° F.;

artificially aging the article at the first temperature for a duration of at least 30 minutes; and

artificially aging the article at a second temperature of from about 325 to about 380° F. for a duration of from about 4 hours to about 36 hours, the second temperature being greater than the first temperature by at least 10° F.

2. A process for improving strength to an article made from an alloy that has been hot deformed and fast cooled, the alloy comprising at least aluminum, copper, lithium and silver, the process comprising:

heating the article to a first temperature of from about 275 to about 340° F.;

artificially aging the article at the first temperature for a duration of at least 30 minutes; and

artificially aging the article at a second temperature of from about 325 to about 380° F. for a duration of from about 4 to about 36 hours, the second temperature being greater than the first temperature by at least 10° F.

3. A process for thermally treating an article made from an AA2195 alloy, the process comprising:

solid solution heat treating the article;

quenching the article;

heating the article to a first temperature of from about 275 to about 340° F.;

artificially aging the article at the first temperature for a duration of at least 30 minutes; and

artificially aging the article at a second temperature of from about 325 to about 380° F. for a duration of from about 4 hours to about 36 hours, the second temperature being greater than the first temperature by at least 10° F.

4. A process for improving strength to an article made from an AA2195 alloy that has been hot deformed and fast cooled, the process comprising:

heating the article to a first temperature of from about 275 to about 340° F.;

artificially aging the article at the first temperature for a duration of at least 30 minutes; and

artificially aging the article at a second temperature of from about 325 to about 380° F. for a duration of from about 4 to about 36 hours, the second temperature being greater than the first temperature by at least 10° F.

Assignments (11)