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

Takashi Kuwahara, Taro Osaka, Mizuki Saito, Shinsuke Suzuki

    研究成果: Article

    抄録

    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.

    元の言語English
    記事番号153
    ジャーナルMetals
    9
    発行部数2
    DOI
    出版物ステータスPublished - 2019 1 1

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    Foams
    Alloying elements
    Crystals
    Brittle fracture
    Energy absorption
    Temperature

    Keywords

      ASJC Scopus subject areas

      • Materials Science(all)

      これを引用

      Compressive properties of A2024 alloy foam fabricated through a melt route and a semi-solid route. / Kuwahara, Takashi; Osaka, Taro; Saito, Mizuki; Suzuki, Shinsuke.

      :: Metals, 巻 9, 番号 2, 153, 01.01.2019.

      研究成果: Article

      Kuwahara, Takashi ; Osaka, Taro ; Saito, Mizuki ; Suzuki, Shinsuke. / Compressive properties of A2024 alloy foam fabricated through a melt route and a semi-solid route. :: Metals. 2019 ; 巻 9, 番号 2.
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      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.",
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      AU - Osaka, Taro

      AU - Saito, Mizuki

      AU - Suzuki, Shinsuke

      PY - 2019/1/1

      Y1 - 2019/1/1

      N2 - 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.

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      KW - Aluminum foam

      KW - Compression test

      KW - Pore morphology

      KW - Precipitation phase

      KW - Primary crystals

      KW - Semi-solid

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