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    Precipitation in cold-rolled Al-Sc-Zr and Al-Mn-Sc-Zr alloys prepared by powder metallurgy

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    Type
    Article
    Authors
    Vlach, Martin
    Stulíková, Ivana
    Smola, Bohumil
    Kekule, Tomáš
    Kudrnová, Hana
    Daniš, Stanislav
    Gemma, Ryota
    Očenášek, Vladivoj
    Málek, Jaroslav
    Tanprayoon, Dhritti
    Neubert, Volkmar
    KAUST Department
    Core Labs
    Physical Science and Engineering (PSE) Division
    Date
    2013-12
    Permanent link to this record
    http://hdl.handle.net/10754/563123
    
    Metadata
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    Abstract
    The effects of cold-rolling on thermal, mechanical and electrical properties, microstructure and recrystallization behaviour of the AlScZr and AlMnScZr alloys prepared by powder metallurgy were studied. The powder was produced by atomising in argon with 1% oxygen and then consolidated by hot extrusion at 350 C. The electrical resistometry and microhardness together with differential scanning calorimetry measurements were compared with microstructure development observed by transmission and scanning electron microscopy, X-ray diffraction and electron backscatter diffraction. Fine (sub)grain structure developed and fine coherent Al3Sc and/or Al3(Sc,Zr) particles precipitated during extrusion at 350 C in the alloys studied. Additional precipitation of the Al3Sc and/or Al3(Sc,Zr) particles and/or their coarsening was slightly facilitated by the previous cold rolling. The presence of Sc,Zr-containing particles has a significant antirecrystallization effect that prevents recrystallization at temperatures minimally up to 420 C. The precipitation of the Al6Mn- and/or Al 6(Mn,Fe) particles of a size ~ 1.0 μm at subgrain boundaries has also an essential antirecrystallization effect and totally suppresses recrystallization during 32 h long annealing at 550 C. The texture development of the alloys seems to be affected by high solid solution strengthening by Mn. The precipitation of the Mn-containing alloy is highly enhanced by a cold rolling. The apparent activation energy of the Al3Sc particles formation and/or coarsening and that of the Al6Mn and/or Al 6(Mn,Fe) particle precipitation in the powder and in the compacted alloys were determined. The cold deformation has no effect on the apparent activation energy values of the Al3Sc-phase and the Al 6Mn-phase precipitation. © 2013 Elsevier Inc.
    Citation
    Vlach, M., Stulikova, I., Smola, B., Kekule, T., Kudrnova, H., Danis, S., … Neubert, V. (2013). Precipitation in cold-rolled Al–Sc–Zr and Al–Mn–Sc–Zr alloys prepared by powder metallurgy. Materials Characterization, 86, 59–68. doi:10.1016/j.matchar.2013.09.010
    Sponsors
    The financial support by The Czech Science Foundation (GACR), post-doc project no. GP P107/11/P201, is gratefully acknowledged. The authors are also grateful to Prof. Jaromir Plagek and Mgr. Tamara Cuckova for their help.
    Publisher
    Elsevier BV
    Journal
    Materials Characterization
    DOI
    10.1016/j.matchar.2013.09.010
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.matchar.2013.09.010
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division

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