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Title: Laminated metal composite formed from low flow stress layers and high flow stress layers using flow constraining elements and making same

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. Additionalmore » 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.« less
Inventors:
 [1];  [2]
  1. (Moraga, CA)
  2. (Livermore, CA)
Issue Date:
OSTI Identifier:
869958
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
Patent Number(s):
US 5429879
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
laminated; 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; /428/228/