Metal treatment – Stock – Age or precipitation hardened or strengthened
Reexamination Certificate
2006-11-14
2006-11-14
Wyszomierski, George (Department: 1742)
Metal treatment
Stock
Age or precipitation hardened or strengthened
C420S532000
Reexamination Certificate
active
07135077
ABSTRACT:
The object of the invention is a rolled, forged or extruded aluminum alloy product more than 12 mm thick, heat treated by solutionizing, quenching and artificial aging, with a microstructure characterized by the following parameters:the fraction of recrystallized grains measured between one-quarter thickness and mid-thickness of the final wrought product is smaller than 35% by volume;the characteristic intercept distance between recrystallized areas is greater than 250 μm, preferably greater than 300 μm and most preferably greater than 350 μm.
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“ASM Handbook: vol. 9 Metallography and Microstructures”, ASM International, 1985, pp. 366-367.
“ASM Handbook: vol. 15: Casting”, ASM International, (1988), pp. 476-481.
Dennison Schultz Dougherty & MacDonald
Morillo Janelle
Pechiney Rhenalu
Wyszomierski George
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