Effect of die surface roughness on deformation characteristics and cavitation during blow forming in a superplastic 5083 alloy

Horng Yu Wu, Chui Hung Chiu, Shyh Hung Sheu, Shyong Lee, Jian Yih Wang

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)2483-2488
Number of pages6
JournalMaterials Transactions
Volume48
Issue number9
DOIs
StatePublished - Sep 2007

Keywords

  • Cavitation
  • Superplastic 5083 aluminum alloy
  • Superplastic forming
  • Surface roughness

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