Precipitation Behavior of P/M Hypereutectic Al–Si–Cu–Mg Alloys Containing Fe and Ni

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  • Gomes Rodinei M.
    Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology
  • Sato Tatsuo
    Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology
  • Tezuka Hiroyasu
    Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology
  • Kamio Akihiko
    Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology

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  • Precipitation Behavior of PM Hypereutec
  • Precipitation Behavior of P/M Hypereutectic Al–Si–Cu–Mg Alloys Containing Fe and Ni

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Abstract

The precipitation phenomena of P/M hypereutectic Al–Si–Cu–Mg alloys with and without Fe and Ni addition were investigated by means of DSC, hardness measurements, TEM and EDX analyses. In order to clarify the effects of high density dislocations introduced in the P/M hypereutectic alloys on the precipitation process, an alloy with low Si was produced by the conventional ingot metallurgy (I/M) and its precipitation kinetics and sequence were compared with those of the P/M alloys. It was found that the addition of Fe and Ni produces intermetallic compounds containing Cu which decrease the volume fraction of GP zones, resulting in the reduced precipitation hardening. The high density dislocations introduced during quenching retard the formation of GP zones and accelerate the precipitation of intermediate phases in the P/M alloys. The precipitation sequence of the P/M hypereutectic alloys is markedly influenced by the formation of the stable Q phase (Al5Cu2Mg8Si6) which modifies the Cu/Mg ratio of the matrix.

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