Superplastic deformation enhanced diffusion bonding of aluminum alloy 7475
Journal Article
·
· Scripta Metallurgica et Materialia
- Lawrence Livermore National Lab., CA (United States)
The purpose of this work is to determine the feasibility of concurrent solid-state diffusion bonding and superplastic forming of Al alloy 7475. The authors used the concept of superplastic deformation to study the diffusion bonding of superplastic Al alloy 7475. Superplastic alloys attain large plastic elongation through grain-boundary sliding -- i.e., very fine internal grains slide and rotate, allowing neighboring grains to switch. Similarly, if grains on the surface are also sliding and rotating, then the oxide film should be disrupted by new grains coming to the surface. A surface that contains these nonoxidized grains should be able to bond with a minimum of applied contact pressure. Thus, the bonds can be produced easily by applying gas pressure during superplastic forming. This is the hypothesis the authors are attempting to prove in this study. It is difficult to make a direct comparison with other reported data, since the diffusion bonding conditions vary significantly. However, it can be concluded that, for a given 7475 composition, prior thermomechanical processing can influence its diffusion-bonding characteristics. Beginning with this preprocessed material, they used a unique method, never before reported, to obtain diffusion bonding concurrently with superplastic forming to achieve ductile, oxide-free bonds at significantly lower pressures in an argon atmosphere. This work clearly proves that superplastic deformation enhances solid state diffusion bonding of aluminum alloy.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 103577
- Journal Information:
- Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 4 Vol. 33; ISSN 0956-716X; ISSN SCRMEX
- Country of Publication:
- United States
- Language:
- English
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