C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
148/35.5
C22F 1/04 (2006.01) C22F 1/053 (2006.01) C22F 1/057 (2006.01)
Patent
CA 1312262
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 incohe- rent hardening phases are precipitated out in a temperature range betweeen the solvus Tgps and the solvus Ts, and in a subsequent step C the aluminides of the above mentioned ele- ments are precipitated as a very dense uniform dispersion by heating in a temperature range between 300°C and Ts-30°C, whereby any deformation by rolling may take place between con- dition A and step C at temperatures not higher than Ts-30°C, and in which process the temperature of the sheet below a thickness of 2.5xd does not exceed 200°C, and the sheet at thickness d is heated to a recrystallization treatment D such that the heating rate is at least 20°C/s until above the re- crystallization threshold.
547946
Hollrigl Gunter
Rodrigues Pedro
Swabey Ogilvy Renault
Swiss Aluminium Ltd.
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