C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
148/35.5
C22F 1/04 (2006.01) C22F 1/043 (2006.01) C22F 1/05 (2006.01) C22F 1/053 (2006.01) C22F 1/057 (2006.01)
Patent
CA 1098806
76SC32 A METHOD OF IMPARTING A FINE GRAIN STRUCTURE TO ALUMINUM ALLOYS HAVING PRECIPITATING CONSTITUENTS N. E. Paton C. H. Hamilton ABSTRACT OF THE DISCLOSURE 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 averaged to form precipitates by heating it above the precipitation hardening temperature for the slloy but below its solution treating temperature. Strain energy is introduced into the alloy by plastically deforming it at or below the averaging temperature used. 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. -1-
299727
Hamilton C. Howard
Paton Neil E.
Ridout & Maybee Llp
Rockwell International Corporation
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