Process for manufacturing a fine-grained recrystallized sheet

Details Process for manufacturing a fine-grained recrystallized sheet Process for manufacturing a fine-grained recrystallized sheet

1987-09-22

1989-01-10

Dean, R.

Metal treatment

Compositions

Heat treating

148 3, 148 127A, 148159, 420902, C22F 104

Patent

active

047971649

ABSTRACT:
In a process for manufacturing a fine-grained recrystallized sheet of heat-treatable i.e. age-hardenable aluminum alloy containing an addition of at least one of the elements Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W amounting in total to 0.08-1.50%, the alloy is brought into a condition A in which the alloying elements that lead to age-hardening and the above mentioned additive elements are, at least for the greater part, in solid solution, following which in step B the incoherent hardening phases are precipitated out in a temperature range between the solvus T.sub.gps and the solvus T.sub.s, and in a subsequent step C the aluminides of the above mentioned elements are precipitated as a very dense uniform dispersion by heating in a temperature range between 300.degree. C. and T.sub.s -30.degree. C., whereby any deformation by rolling may take place between condition A and step C at temperatures not higher than T.sub.s -30.degree. C., and in which process the temperature of the sheet below a thickness or 2.5 xd does not exceed 200.degree. C., and the sheet at thickness d is heated to a recrystallization treatment D such that the heating rate is at least 20.degree. C./s until above the recrystallization threshold.

REFERENCES:
patent: 4528042 (1985-07-01), Ward et al.

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