Method of superplastically forming and diffusion bonding a laminate assembly
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United States of America Patent
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Jan 15, 1991
Grant Date -
N/A
app pub date -
Feb 3, 1989
filing date -
Feb 3, 1989
priority date (Note) -
Expired
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Abstract
A method is provided for achieving predetermined thickness requirements throughout a superplastically formed structure having extreme contours. A laminate assembly of sheets of a metal capable of exhibiting superplasticity, such as titanium alloy, is formed by a combination of superplastic forming and diffusion bonding. The shapes and positioning of the sheets is selected to provide extra metal where the greatest degree of stretching is necessary, such as around the lobes of an exhaust mixer for a turbofan aircraft engine. The gauge can thus be controlled throughout the structure while avoiding weak points and undue weight.
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