High strength aluminum alloy for forming fin and method of manuf

Details High strength aluminum alloy for forming fin and method of manuf High strength aluminum alloy for forming fin and method of manuf

1994-12-22

1996-09-10

Andrews, Melvyn

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148552, 148693, 148697, 148698, 148415, 148437, 420548, 420551, 420553, C22F 104

Patent

active

055542344

ABSTRACT:
The present invention provides a high strength aluminum alloy suitable for use in the manufacture of a fin, said aluminum alloy containing at most 0.1% by weight of Si, 0.10 to 1.0% by weight of Fe, 0.1 to 0.50% by weight of Mn, 0.01 to 0.15% by weight of Ti, and the balance of Al and unavoidable impurities, intermetallic compounds having a diameter not larger than 0.1 .mu.m being distributed within the metal texture of the alloy in a number density of at least 10/.mu.m.sup.3. The present invention also provides a method of manufacturing a high strength aluminum alloy suitable for use in the manufacture of a fin, comprising the steps of heating to 430.degree. to 580.degree. C. an aluminum alloy ingot of the composition noted above, applying a hot rolling treatment to said aluminum alloy ingot to obtain a plate material before the temperature of the aluminum alloy ingot is lowered by at most 50.degree. C. from the temperature immediately after the heating step, applying a cold rolling treatment to the resultant plate material such that the final rate of reduction in the thickness of the plate material is at least 80%, and applying a homogenizing annealing treatment to the cold rolled thin plate material at 250.degree. to 320.degree. C. to cause intermetallic compounds having a diameter not larger than 0.1 .mu.m to be distributed within the metal texture of the alloy in a number density of at least 10/.mu.m.sup.3.

REFERENCES:
patent: 4244756 (1981-01-01), Tanabe et al.
patent: 4686083 (1987-08-01), Takizawa et al.
patent: 5019188 (1991-05-01), Hasenclever

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