Refining recrystallized grain size in aluminum alloys

• US 3,938,991 A
• Filed: 07/15/1974
• Issued: 02/17/1976
• Est. Priority Date: 07/15/1974
• Status: Expired due to Term

• Current Assignee: Swiss Aluminium, Ltd.
• Original Assignee: Swiss Aluminium, Ltd.
• Inventors: Setzer, William C., Sperry, Philip R.
• Primary Examiner(s): Dean, R.
• Application Number:
  US05/488,677
• Time in Patent Office: 582 Days
• Field of Search: 75/148, 75/143, 75/147, 75/138, 75/142, 75/141, 75/146, 148/32, 148/32.5, 148/11.5 A, 148/2, 148/3, 148/13
• US Class Current: 420/538
• CPC Class Codes: C22C 1/026 Alloys based on aluminium
• CPC Class Codes: C22C 21/00 Alloys based on aluminium

Abstract

A wrought article possessing a fine recrystallized grain size which is prepared from an aluminum base alloy comprising, in weight percent, up to .6% silicon, up to .7% iron, up 1.5% manganese and 0.03 - 0.20% vanadium. The alloy may be cast by the DC casting method and does not require a homogenizing treatment. The alloy may be hot and cold worked, and retains its fine grain through annealing without requiring a high rate of heating to annealing temperature.

Claims

1. An aluminum base alloy possessing a fine recrystallized grain size in the annealed condition which consists of 0.03 - 0.6% silicon, 0.03 - 0.7% iron, 0.03 - 1.5% manganese, 0.03 - 0.20% vanadium, up to 0.3% copper, up to 0.2% titanium, balance aluminum.

2. The alloy of claim 1 wherein said vanadium is retained in solid solution.

3. The alloy of claim 1 comprising about 0.10 - 0.20% silicon, about 0.40 - 0.60% iron, about 0.10 - 0.20% copper, about 0.10 - 1.5% manganese, about 0.005 - 0.02% titanium and 0.03 - 0.12% vanadium.

4. The alloy of claim 1 wherein said alloy is in the annealed condition.

5. The alloy of claim 1 wherein said alloy is in the annealed and cold worked condition.

6. A wrought article possessing a fine recrystallized grain size prepared from an aluminum base alloy consisting of 0.03 - 0.6% silicon, 0.03 - 0.7% iron, 0.03 - 1.5% manganese, 0.03 - 0.20% vanadium, up to 0.3% copper, up to 0.2% titanium, balance aluminum.

7. The article of claim 6 wherein said alloy comprises about 0.10 - 0.20% silicon, about 0.40 - 0.60% iron, about 0.10 - 0.20% copper, about 0.10 - 1.5% manganese, about 0.005 - 0.02% titanium and 0.03 - 0.12% - vanadium.

8. The article of claim 6 wherein said vanadium is retained in solid solution.

9. The article of claim 6 wherein said article is in the annealed condition.

10. The article of claim 6 wherein said article is in the annealed and cold worked condition.

11. A method for the preparation of wrought products possessing a fine recrystallized grain size which consists essentially of:

A. providing an aluminum base alloy consisting of 0.03 - 0.6% silicon, 0.03 - 0.7% iron, 0.03 - 1.5% manganese, 0.03 - 0.20% vanadium, up to 0.3% copper, up to 0.2% titanium, balance aluminum;

B. casting said alloy;

C. heating said alloy to a homogenizing temperature;

D. hot and cold working said alloy;

E. wherein said cold working is followed by at least one annealing treatment which does not require a high rate of heating to annealing temperature.

12. The method of claim 11 wherein said alloy comprises about 0.10 - 0.20% silicon, about 0.40 - 0.60% iron, about 0.10 - 0.20% copper, about 0.10 - 1.5% manganese, about 0.005 - 0.02% titanium and 0.03 - 0.12% vanadium.

13. The method of claim 11 wherein said hot working is commenced at a temperature ranging from about 850°

- 950°

F.

14. The method of claim 13 wherein said hot working is commenced at a temperature of about 900°

F.

15. The method of claim 11 wherein said alloys are hot and cold worked by rolling.

16. The method of claim 11 wherein said cold working includes at least one interanneal.

17. The method of claim 11 wherein the heating of step C is conducted for no more than about four hours at a temperature of about 1100°

F.

18. The method of claim 11 wherein said rate of heating in step E is no more than about 50°

F/hour.