Foaming behavior of blowing- and stabilization-agent-free aluminum foam precursor during spot friction stir welding

Yoshihiko Hangai, Keisuke Takada, Hidetoshi Fujii, Yasuhiro Aoki, Takao Utsunomiya

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1 Citation (Scopus)


ADC12 die-casting precursors containing many gas pores were fabricated by the friction stir welding (FSW) route and were foamed by the FSW foaming process only using the friction heat during the indentation of the tool used for spot FSW. ADC12 precursors can be foamed by the friction heat generated during spot FSW without using TiH2 as a blowing agent. ADC12 foams can be obtained without using Al2O3 as a stabilization agent. This is considered to be due to impurities contained in the ADC12 die-castings. ADC12 foams with Al2O3 exhibited a larger expansion ratio than those without Al2O3. ADC12 foams with Al2O3 had significantly finer pores than those without Al2O3. The pore diameters of the ADC12 foams with Al2O3 were approximately half of those of the foams without Al2O3. This is considered to be due to the higher viscosity of the ADC12 substrate containing Al2O3.

Original languageEnglish
Pages (from-to)185-190
Number of pages6
JournalJournal of Materials Processing Technology
Publication statusPublished - 2019 Mar 1



  • Cellular materials
  • Foaming
  • Friction stir welding
  • Precursor

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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