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US 10,648,066 B2Granted
Reduced aging time of 7xxx series alloy
AssigneeNovelis Inc.
InventorsRajeev G. Kamat, Hashem Mousavi-Anijdan, Rahul Kulkarni, Mario A. Salgado-Ordorica
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Abstract
The present invention relates to the reduction of artificial aging time of 7xxx series alloys. Currently, the artificial aging times for typical 7xxx series alloy can be as long as 24 hrs. The current invention allows for a significant reduction of aging times, thereby saving time, energy, money and storage space hence increasing the productivity.
Claims18
A method for achieving a yield strength and elongation in an 7xxx aluminum alloy sheet comprising:
- a) heating the sheet to a temperature of 450° C. to 510° C.;
- b) maintaining the sheet at the temperature of 450° C. to 510° C. for up to 20 minutes;
- c) cooling the sheet to room temperature at more than 50° C. per second;
- d) heating the sheet to a temperature between about 50° C. and 150° C.;
- e) maintaining the sheet at the temperature between about 50° C. and 150° C. for a duration of about 1 hour
- f) heating the sheet at a temperature between about 150° C. and 200° C.;
- and,
- g) maintaining the sheet at the temperature between about 150° C. and 200° C. for a duration of about 0.5 to 6 hrs.
5 more elements
A method for achieving a yield strength and elongation in an 7xxx aluminum alloy sheet comprising:
- a) heating the sheet to a temperature of 450° C. to 510° C.;
- b) maintaining the sheet at the temperature of 450° C. to 510° C. for up to 20 minutes;
- c) cooling the sheet to room temperature at more than 50° C. per second;
- d) heating the sheet to a temperature of from about 130° C. to about 150° C.;
- e) maintaining the sheet at the temperature of from about 130° C. to about 150° C. for a duration of about 1 to 5 hrs
- f) heating the sheet at a temperature between about 150° C. and 200° C.;
- and,
- g) maintaining the sheet at the temperature between about 150° C. and 200° C. for a duration of about 0.5 to 6 hrs.
5 more elements
Dependencies are inferred from the claim text.