Metal treatment – Compositions – Heat treating
Patent
1987-09-21
1989-09-05
Dean, R.
Metal treatment
Compositions
Heat treating
148159, 148417, 148418, 148439, C22F 104
Patent
active
048635286
ABSTRACT:
There is disclosed a method for producing an aluminum alloy product and the resulting product having improved combinations of strength and corrosion resistance. The method includes providing an alloy consisting essentially of about 6-16% zinc, about 1.5-4.5% magnesium, about 1-3% cooper, one or more elements selected from zirconium, chromium, manganese, titanium, vanadium and hafnium, the total of said elements not exceeding about 1%, the balance aluminum and incidental impurities. The alloy is then solution heat treated; precipitation hardened to increase its strength to a level exceeding the as-solution heat treated strength level by at least about 30% of the difference between as-solution heat treated strength and peak strength; subjected to treatment at a sufficient temperature or temperatures for improving its corrosion resistance properties; and again precipitation hardened to raise its yield strength and produce a high strength, highly corrosion resistant alloy product.
REFERENCES:
patent: 2248185 (1941-07-01), Nock
patent: 3198676 (1965-08-01), Sprowls et al.
patent: 3231435 (1966-01-01), Rotsell et al.
patent: 3287185 (1966-11-01), Vachet et al.
patent: 3305410 (1967-02-01), Sublett et al.
patent: 3563814 (1971-02-01), Lyle et al.
patent: 3645804 (1972-02-01), Ponchel
patent: 3836405 (1974-09-01), Staley et al.
patent: 3856584 (1974-12-01), Cina
patent: 3881966 (1975-05-01), Staley et al.
patent: 3945861 (1976-03-01), Anderson et al.
patent: 3947297 (1976-03-01), Reimann et al.
patent: 4063936 (1977-12-01), Nagase et al.
patent: 4069072 (1978-01-01), Develay et al.
patent: 4126448 (1978-11-01), Moore et al.
patent: 4189334 (1980-02-01), Dubost et al.
patent: 4193822 (1980-03-01), Adam et al.
patent: 4200476 (1980-04-01), Dubost et al.
patent: 4305763 (1981-12-01), Quist et al.
patent: 4345951 (1982-08-01), Coupry et al.
patent: 4431467 (1984-02-01), Staley et al.
patent: 4477292 (1984-10-01), Brown
patent: 4629517 (1986-12-01), Lifka et al.
patent: 4732610 (1988-03-01), Hildeman et al.
"Precipitation Hardening and Stress Corrosion in AlZnMg.sub.3 ", W. Gruhl et al., Z. Metallkunde, vol. 55, No. 10, pp. 577-582, (1964).
"Thermomechanical Treatments on High Strength Al--Zn--Mg(--Cu) Alloys", Metallurgical Transactions, vol. 4, pp. 1133-1144, (Apr. 1973).
"New Technique for Reducing Susceptibility to Stress-Corrosion of High Strength Aluminum Alloys", Published by the Pittsburgh Chapter of the American Society for Metals, (1974).
"A New Approach to the Problem of Stress Corrosion Cracking in 7075-T6 Aluminum", Canadian Aeronautics and Space Journal, vol. 27, No. 3, pp. 222-232, (1981).
"Microstructural Study of a High-Strength Stress-Corrosion Resistant 7075 Aluminum Alloy", Journal of Materials Science, vol. 17, pp. 2817-2824, (1982).
"Retrogression and Reaging Response of 7475 Aluminum Alloy", Metals Technology, vol. 10, pp. 386-392, (Oct. 1983).
J. T. Staley, Investigation to Improve the Stress-Corrosion Resistance of Aluminum Aircraft Alloys Through Alloy Additions and Specialized Heat Treatment, Under NAVAIR Contract N00019-68-C-0146, Oct. 1, 1972.
Brown Melvin H.
Lee Sootae
Liu John
Staley James T.
Aluminum Company of America
Dean R.
Lippert Carl R.
Sullivan Jr. Daniel A.
Topolosky Gary P.
LandOfFree
Aluminum alloy product having improved combinations of strength does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Aluminum alloy product having improved combinations of strength , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aluminum alloy product having improved combinations of strength will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-240967