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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.48  No.9 (2007)  >  pp.2483-2488

MATERIALS TRANSACTIONS
<<Previous article Vol.48  No.9 (2007)   pp.2483 - 2488 Next article>>

Effect of Die Surface Roughness on Deformation Characteristics and Cavitation during Blow Forming in a Superplastic 5083 Alloy

Horng-yu Wu1), Chui-hung Chiu1), Shyh-hung Sheu1), Shyong Lee2) and Jian-yih Wang3)
1) Institute of Engineering Science, Chung-hua University
2) Department of Mechanical Engineering, National Central University
3) Department of Materials Science and Engineering, National Dong Hwa University


Effect of die surface roughness on deformation behavior of a superplastic material has relatively been less examined, though it is important for industrial application during die design. In this paper, a superplastic 5083 Al alloy under bi-axial deformation was investigated by deforming the sheet into a rectangular die cavity with different degrees of die surface roughness. It was found that reducing the interfacial friction by use of a die with a smaller surface roughness improved the metal flow after the deformed sheet had made contact with the die bottom surface. Changes of the metal flow during forming not only developed a better thickness distribution of the formed part, but also reduced the cavitation levels.


Keyword:
superplastic forming, superplastic 5083 aluminum alloy, surface roughness, cavitation

Received: November 06, 2006
Accepted: June 14, 2007 , Published online: August 25, 2007
Copyright (c) 2007 The Japan Institute of Metals

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