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Extrusion of the bimetallic aluminum-magnesium rods and tubes

Strangpressen von bimetallischen Aluminium-Magnesium-Rundprofilen und -Rohren

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Abstract

On the basis of theoretical and experimental studies the complex influence of process conditions such as the geometric characteristics of the billet and the tool were investigated regarding the extrusion of bimetallic rods and tubes. As a core material magnesium alloys of the Mg-Al-Zn system and as shell materials aluminum and its alloys of the Al-Mg-Si and Al-Zn-Mg were extruded. An increase in the strength properties of the aluminum alloy shell—compared to the core of a magnesium alloy—increases the inhomogeneity of the speed distribution of the metal flow resulting in defects. A sustainable processing can be established by the extrusion of bimetallic rods which consist of an Mg-Al-Zn-Mn core and an Al-Mg-Si shell.

Zusammenfassung

Der komplexe Einfluss von Prozessbedingungen wie z.B. die Pressbolzen- und Matrizengeometrie beim Verbundstrangpressen von Voll- und Hohlprofilen wurde anhand von experimentellen und numerischen Untersuchungen analysiert. Als Kernmaterial wurden Legierungen des Mg-Al-Zn-Systems und als Hüllmaterial Al-Mg-Si- bzw. Al-Zn-Mg-Legierungen stranggepresst. Eine Erhöhung der Festigkeit des Hüllmaterials – im Vergleich zum Kernmaterial – steigert die Inhomogenität der Geschwindigkeitsverteilung und führt zu Defekten. Stabile Pressbedingungen können beim Verbundstrangpressen von Mg-Al-Zn-Mn-Legierungen als Kernmaterial und Al-Mg-Si-Legierungen als Hüllmaterial erzielt werden.

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Acknowledgement

The authors would like to thank the coworkers of the Institut für Umformtechnik und Umformmaschinen IFUM of the Leibniz Universität Hannover for the supported material characterization.

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Authors and Affiliations

  1. National Metallurgical Academy of Ukraine, Gagarin av. 4, 49600, Dnipropetrovs’k, Ukraine

    O. Golovko, S.M. Bieliaiev & V.M. Danchenko

  2. Institut für Werkstoffkunde, Leibniz Universität Hannover, 30823, Garbsen, Hannover

    F. Nürnberger

Authors
  1. O. Golovko
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  2. S.M. Bieliaiev
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  3. F. Nürnberger
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  4. V.M. Danchenko
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Corresponding author

Correspondence to F. Nürnberger.

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Golovko, O., Bieliaiev, S., Nürnberger, F. et al. Extrusion of the bimetallic aluminum-magnesium rods and tubes. Forsch Ingenieurwes 79, 17–27 (2015). https://doi.org/10.1007/s10010-015-0184-3

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  • DOI: https://doi.org/10.1007/s10010-015-0184-3

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