Compressive properties of A2024 alloy foam fabricated through a melt route and a semi-solid route

Takashi Kuwahara*, Taro Osaka, Mizuki Saito, Shinsuke Suzuki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A2024 alloy foams were fabricated by two methods. In the first method, the melt was thickened by Mg, which acts as an alloying element (melt route). In the second method, the melt was thickened by using primary crystals at a semi-solid temperature with a solid fraction of 20% (semi-solid route). A2024 alloy foams fabricated through the semi-solid route had coarse and uneven pores. This led to slightly brittle fracture of the foams, which resulted in larger energy absorption efficiency than that of the foams fabricated through the melt route. Moreover, A2024 alloy foams fabricated through the semi-solid route had a coarser grain size because of the coarse primary crystals. However, by preventing the decrease in the alloying element Mg, the θ/θ’ phase was suppressed. Additionally, by preventing the precipitation of the S phase, the amount of Guinier-Preston-Bagaryatsky (GPB) zone increased. This resulted in a larger plateau stress.

Original languageEnglish
Article number153
JournalMetals
Volume9
Issue number2
DOIs
Publication statusPublished - 2019

Keywords

  • Age hardening
  • Aluminum foam
  • Compression test
  • Pore morphology
  • Precipitation phase
  • Primary crystals
  • Semi-solid

ASJC Scopus subject areas

  • Materials Science(all)

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