Method of imparting a fine grain structure to aluminum alloys ha

Details Method of imparting a fine grain structure to aluminum alloys ha Method of imparting a fine grain structure to aluminum alloys ha

1979-07-30

1980-09-16

Dean, R.

Metal treatment

Compositions

Heat treating

C22F 104

Patent

active

042227976

ABSTRACT:
A method is provided for imparting a fine grain structure to aluminum alloys which have precipitating constituents. The alloy is first heated to a solid solution temperature to dissolve the precipitating constituents in the alloy. The alloy is then cooled, preferably by water quenching, to below the solution temperature and then overaged to form precipitates by heating it above the precipitation hardening temperature for the alloy but below its solution treating temperature. Strain energy is introduced into the alloy by plastically deforming it in a temperature range of 380.degree. F. to 450.degree. F. to reduce its cross-sectional area a total of 40% minimum, at least 25% of the reduction in area being accomplished in a single continuous deformation operation. The alloy is then subsequently held at a recrystallization temperature so that new grains are nucleated by the overaged precipitates and the development of these grains results in a fine grain structure.

REFERENCES:
patent: 4092181 (1978-05-01), Paton et al.

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