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Diffusion Bonding of Superplastic 7075 Aluminum Alloy

Published online by Cambridge University Press:  16 February 2011

Huang Yan ,
Cui Jianzhong  and
Ma Longxiang
Huang Yan
Affiliation:
Metalforming Dep., Northeast Univ of Teohnol., Wenhua Lu,Heping District, Shenyang, China.
Cui Jianzhong
Affiliation:
Metalforming Dep., Northeast Univ of Teohnol., Wenhua Lu,Heping District, Shenyang, China.
Ma Longxiang
Affiliation:
Metalforming Dep., Northeast Univ of Teohnol., Wenhua Lu,Heping District, Shenyang, China.
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Abstract

Because of the presence of surface oxide films, aluminum alloys are very difficult to join by diffusion bonding processes when there are no interlayers between mating surfaces. In the present investigation, the diffusion bonding of superplastic 7075 aluminum alloy has been carried out using a special method for surface treatment in the temperature range 500∼520°C, at pressures of 2.07∼3.OMPa, times of 90∼150min and a vaccum of 1×10−5torr. The joint strength obtained is the same as the base metal strength of the alloy, and the joint microstructure is indistinguishable from that of the base metal. In this paper, the effect of the superplastic treatment of the alloy on the bonding process is discussed, and it is proposed that the bonding mechanism is the migration of the initial bond interface caused both by the diffusion of atoms and by the growth of grains during the diffusion bonding process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 196: Symposium T – Superplasticity in Metals, Ceramics, and Intermetallics , 1990 , 149
Copyright
Copyright © Materials Research Society 1990

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References

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