Laminated metal composite formed from low flow stress layers and high flow stress layers using flow constraining elements and making same
- Moraga, CA
- Livermore, CA
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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 5429879
- OSTI ID:
- 869958
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
metal
composite
formed
flow
stress
layers
constraining
elements
described
preferably
shape
rings
individually
placed
pressure
applied
stack
bond
restrain
bonding
steps
forming
alternate
layer
material
surrounded
individual
element
applying
top
bottom
surfaces
resulting
dissimilar
example
compression
rolling
preferred
embodiment
surrounding
comprising
similar
characteristics
additional
sacrificial
added
avoid
damage
step
removed
avoid damage
laminated metal
additional layers
flow stress
bottom surfaces
alternate layers
material comprising
preferred embodiment
bottom surface
metal composite
applying pressure
stress layers
composite formed
sacrificial layers
stress characteristics
material surround
material surrounded
dissimilar layers
sacrificial layer
additional layer
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