Laminated metal composite formed from low flow stress layers and

Details Laminated metal composite formed from low flow stress layers and Laminated metal composite formed from low flow stress layers and

1994-09-26

1995-07-04

Zimmerman, John

Stock material or miscellaneous articles

All metal or with adjacent metals

Laterally noncoextensive components

428608, 428635, 428686, 228190, B32B 318, B32B 1514, B23K 2000

Patent

active

054298792

ABSTRACT:
A laminated metal composite of low flow stress layers and high flow stress layers is described which is formed using flow constraining elements, preferably in the shape of rings, individually placed around each of the low flow stress layers while pressure is applied to the stack to bond the layers of the composite together, to thereby restrain the flow of the low flow stress layers from the stack during the bonding. The laminated metal composite of the invention is made by the steps of forming a stack of alternate layers of low flow stress layers and high flow stress layers with each layer of low flow stress material surrounded by an individual flow constraining element, such as a ring, and then applying pressure to the top and bottom surfaces of the resulting stack to bond the dissimilar layers together, for example, by compression rolling the stack. In a preferred embodiment, the individual flow constraining elements surrounding the layers of low flow stress material are formed of a material which may either be the same material as the material comprising the high flow stress layers, or have similar flow stress characteristics to the material comprising the high flow stress layers. Additional sacrificial layers may be added to the top and bottom of the stack to avoid damage to the stack during the bonding step; and these additional layers may then be removed after the bonding step.

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