Superplastic deformation of diffusion bonded aluminium...

Details Superplastic deformation of diffusion bonded aluminium... Superplastic deformation of diffusion bonded aluminium...

B - Operations, Transporting

23

K

B23K 20/233 (2006.01) B21D 26/02 (2006.01)

Patent

CA 2112579

The low peel strengths of diffusion bonded joints in aluminium alloy structures has been a bar to their use in superplastic forming. The invention overcomes this disadvantage by creating a workpiece intended for subsequent superplastic forming by dif- fusion bonding an assembly of alloy sheets (30-32) in bonding zones according to a predetermined pattern and providing reinfor- cing material (33) in the workpiece in the region of the diffusion bonded zones. The reinforcing material serves to prevent the ten- sile stresses exerted during subsequent superplastic forming from initiating peel fracture of the diffusion bonds. Instead, the tensile stresses act so as to bring about superplastic deformation in those regions of the workpiece between the diffusion bonded zones.

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