Elimination of aluminum-lithium sheet anisotropy with SPF formin

Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal

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148690, 148437, 148438, 148439, 148440, 72 60, 72364, C22F 104

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active

055036929

ABSTRACT:
A novel method is disclosed for removing or eliminating anisotropic material properties typically found in conventionally rolled or otherwise processed aluminum-lithium alloy products obtained from conventional aluminum fabrication mills. The method comprises imparting a predetermined amount of strain to the conventionally rolled alloy sheet whereby the alloy experiences dynamic recrystallization. Through this process, the mill-imposed crystallographic texturing, which initially sets up the undesired anisotropic characteristics, is eliminated. A preferred technique for imparting strain to the sheet stock is superplastic forming.

REFERENCES:
patent: 4516419 (1985-05-01), Agrawal
patent: 4874440 (1989-10-01), Sawtell et al.
patent: 5019183 (1991-05-01), Martin
"Metals Handbook" (9th Edition); vol. 8, p. 553; ASM, Metals Park, Ohio, 1985.

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