Aluminum alloy foam-filled aluminum tube fabricated by friction stir back extrusion and its compression properties

Yoshihiko Hangai, Shunsuke Otazawa, Takao Utsunomiya

Research output: Research - peer-reviewArticle

  • 1 Citations

Abstract

Al tubes filled with Al foam were fabricated by friction stir back extrusion (FSBE), which can realize metal bonding between the foam and tube. In this process, an Al tube was first fabricated from bulk Al. Next, foamable precursor was coated on the surface of the inner wall of the fabricated tube. Thereafter, the tube coated with the precursor was heat-treated to foam the precursor, thus obtaining a tube filled with foam. In the tube fabrication process, it was found that a tube can be fabricated from a block with no defects and similar compression responses to that of a tube fabricated by a machining process. For the foaming process, it was found that the bonding of the precursor and tube induces strong bonding between the foam and tube. Regarding the compression properties of the tube, it was found that the foam-filled tube exhibited superior compression properties to empty tubes and foams. In particular, during compression tests, a decrease in the stress in stress-strain curves for an empty tube due to the generation of a fold can be avoided by filling the tube with foam filler with metal bonding between the foam and tube.

LanguageEnglish
JournalComposite Structures
DOIs
StateAccepted/In press - 2017 Jan 27

Fingerprint

Aluminum
Extrusion
Foams
Aluminum alloys
Compaction
Friction
Metals
Stress-strain curves
Fillers
Machining
Fabrication
Defects
Hot Temperature

Keywords

  • Cellular materials
  • Composites
  • Foam
  • Friction welding

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering

Cite this

Aluminum alloy foam-filled aluminum tube fabricated by friction stir back extrusion and its compression properties. / Hangai, Yoshihiko; Otazawa, Shunsuke; Utsunomiya, Takao.

In: Composite Structures, 27.01.2017.

Research output: Research - peer-reviewArticle

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N2 - Al tubes filled with Al foam were fabricated by friction stir back extrusion (FSBE), which can realize metal bonding between the foam and tube. In this process, an Al tube was first fabricated from bulk Al. Next, foamable precursor was coated on the surface of the inner wall of the fabricated tube. Thereafter, the tube coated with the precursor was heat-treated to foam the precursor, thus obtaining a tube filled with foam. In the tube fabrication process, it was found that a tube can be fabricated from a block with no defects and similar compression responses to that of a tube fabricated by a machining process. For the foaming process, it was found that the bonding of the precursor and tube induces strong bonding between the foam and tube. Regarding the compression properties of the tube, it was found that the foam-filled tube exhibited superior compression properties to empty tubes and foams. In particular, during compression tests, a decrease in the stress in stress-strain curves for an empty tube due to the generation of a fold can be avoided by filling the tube with foam filler with metal bonding between the foam and tube.

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