Effect of Mn addition on the age-hardening behavior of an Al-(9-10)%Si-0.3%Mg die casting alloy in T5 and T6 heat treatment

Keita Fukasawa, Ryousuke Mohri, Tetsuo Ohtake, Tatsuya Inoue, Akihiro Kuroda, Hiroshi Kambe, Makoto Yoshida

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    This study investigated the effect of Mn adding on the T5 and T6 age-hardening behaviors of Al-(9.0-10.0)%Si-0.3%Mg (equivalent to A360 alloy) and Al-10%Si-2%Cu-0.3%Mg (equivalent to A383 alloy) die casting alloys using a hardness measurement, an electron probe micro analyzer (EPMA) and thermodynamic software. When 0.4%Mn was added, the hardness of the T5 heat-treated Al-Si-Mg die casting alloy increases because the Mn addition suppresses the formation of the π-Al8FeMg3Si6 phase during solidification and distributes Mg into the a solid solution. This mechanism named as π-phase suppression mechanism promotes precipitation strengthening. In the T6 heat treatment, the hardness of the alloys hardly increased when Mn was added. In the Al-Si-Cu-Mg alloys, the hardening by the 0.5%Mn addition was negligible compared to that of the Al-Si-Mg alloys regardless of T5 or T6 treatment. Therefore, the hardening by Mn addition is the characteristic phenomenon in the T5 heat-treated Al-Si-Mg high-pressure die casting alloy.

    Original languageEnglish
    Pages (from-to)959-965
    Number of pages7
    JournalMaterials Transactions
    Volume57
    Issue number6
    DOIs
    Publication statusPublished - 2016

    Fingerprint

    precipitation hardening
    Die casting
    Age hardening
    heat treatment
    Heat treatment
    hardness
    Hardness
    hardening
    Hardening
    heat
    Strengthening (metal)
    electron probes
    solidification
    Solidification
    Solid solutions
    analyzers
    solid solutions
    retarding
    Thermodynamics
    computer programs

    Keywords

    • A360
    • Die casting
    • Heat treatment
    • Manganese
    • T5

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering
    • Mechanics of Materials

    Cite this

    Effect of Mn addition on the age-hardening behavior of an Al-(9-10)%Si-0.3%Mg die casting alloy in T5 and T6 heat treatment. / Fukasawa, Keita; Mohri, Ryousuke; Ohtake, Tetsuo; Inoue, Tatsuya; Kuroda, Akihiro; Kambe, Hiroshi; Yoshida, Makoto.

    In: Materials Transactions, Vol. 57, No. 6, 2016, p. 959-965.

    Research output: Contribution to journalArticle

    Fukasawa, Keita ; Mohri, Ryousuke ; Ohtake, Tetsuo ; Inoue, Tatsuya ; Kuroda, Akihiro ; Kambe, Hiroshi ; Yoshida, Makoto. / Effect of Mn addition on the age-hardening behavior of an Al-(9-10)%Si-0.3%Mg die casting alloy in T5 and T6 heat treatment. In: Materials Transactions. 2016 ; Vol. 57, No. 6. pp. 959-965.
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    abstract = "This study investigated the effect of Mn adding on the T5 and T6 age-hardening behaviors of Al-(9.0-10.0){\%}Si-0.3{\%}Mg (equivalent to A360 alloy) and Al-10{\%}Si-2{\%}Cu-0.3{\%}Mg (equivalent to A383 alloy) die casting alloys using a hardness measurement, an electron probe micro analyzer (EPMA) and thermodynamic software. When 0.4{\%}Mn was added, the hardness of the T5 heat-treated Al-Si-Mg die casting alloy increases because the Mn addition suppresses the formation of the π-Al8FeMg3Si6 phase during solidification and distributes Mg into the a solid solution. This mechanism named as π-phase suppression mechanism promotes precipitation strengthening. In the T6 heat treatment, the hardness of the alloys hardly increased when Mn was added. In the Al-Si-Cu-Mg alloys, the hardening by the 0.5{\%}Mn addition was negligible compared to that of the Al-Si-Mg alloys regardless of T5 or T6 treatment. Therefore, the hardening by Mn addition is the characteristic phenomenon in the T5 heat-treated Al-Si-Mg high-pressure die casting alloy.",
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    AU - Ohtake, Tetsuo

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    AU - Kuroda, Akihiro

    AU - Kambe, Hiroshi

    AU - Yoshida, Makoto

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    AB - This study investigated the effect of Mn adding on the T5 and T6 age-hardening behaviors of Al-(9.0-10.0)%Si-0.3%Mg (equivalent to A360 alloy) and Al-10%Si-2%Cu-0.3%Mg (equivalent to A383 alloy) die casting alloys using a hardness measurement, an electron probe micro analyzer (EPMA) and thermodynamic software. When 0.4%Mn was added, the hardness of the T5 heat-treated Al-Si-Mg die casting alloy increases because the Mn addition suppresses the formation of the π-Al8FeMg3Si6 phase during solidification and distributes Mg into the a solid solution. This mechanism named as π-phase suppression mechanism promotes precipitation strengthening. In the T6 heat treatment, the hardness of the alloys hardly increased when Mn was added. In the Al-Si-Cu-Mg alloys, the hardening by the 0.5%Mn addition was negligible compared to that of the Al-Si-Mg alloys regardless of T5 or T6 treatment. Therefore, the hardening by Mn addition is the characteristic phenomenon in the T5 heat-treated Al-Si-Mg high-pressure die casting alloy.

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