High strength Al–Al2O3p composites: Optimization of extrusion parameters

B.F. Luan, Niels Hansen, A. Godfrey, G.H. Wu, Q. Liu

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Composite aluminium alloys reinforced with Al2O3p particles have been produced by squeeze casting followed by hot extrusion and a precipitation hardening treatment. Good mechanical properties can be achieved, and in this paper we describe an optimization of the key processing parameters. The parameters investigated are the extrusion temperature, the extrusion rate and the extrusion ratio. The materials chosen are AA 2024 and AA 6061, each reinforced with 30vol.% Al2O3 particles of diameter typically in the range from 0.15 to 0.3μm. The extruded composites have been evaluated based on an investigation of their mechanical properties and microstructure, as well as on the surface quality of the extruded samples. The evaluation shows that material with good strength, though with limited ductility, can be reliably obtained using a production route of squeeze casting, followed by hot extrusion and a precipitation hardening treatment. For the extrusion step optimized processing parameters have been determined as: (i) extrusion temperature=500°C–560°C; (ii) extrusion rate=5mm/s; (iii) extrusion ratio=10:1.
    Original languageEnglish
    JournalMaterials & Design
    Volume32
    Issue number7
    Pages (from-to)3810-3817
    ISSN0264-1275
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Superconducting materials

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