Journal of Materials Science

, Volume 51, Issue 8, pp 3888–3896 | Cite as

Characterization of weld seam properties of extruded magnesium hollow profiles

  • Felix Gensch
  • Sven Gall
  • Christoph Fahrenson
  • Sören Müller
  • Walter Reimers
Original Paper


Extrusions of hollow profiles with weld seams were conducted using the magnesium alloy ME21 applying various extrusion ratios. Subsequent analysis of the profiles’ microstructure was performed comparing weld free with weld seam containing material using (polarized) light optical microscopy (LOM). Additionally, the local texture and microstructure in the weld-free material as well as in the weld seam region has been examined with a scanning electron microscope coupled with electron backscatter diffraction technique (SEM-EBSD). The weld-free material and the weld seam are characterized by recrystallized microstructures, whereas few residual cast grains were identified. The local texture distinctively changes from the weld-free material to the weld seam. The texture of the weld-free material is comparable with the typical ME21 sheet texture. In the weld seam area, a pole density is found, which is distributed towards the transverse direction (TD) combined with a split and broadening of the pole density in the extrusion direction (ED). This texture influences the mechanical anisotropy due to the dependence of the activation of basal 〈a〉-slip and \( \{ 10\bar{1}2\} \;\langle 10\bar{1}1\rangle \)-extension twinning on the loading direction in favorably oriented grains.


Transverse Direction Weld Seam Weld Line Extrusion Direction Extrusion Ratio 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors are grateful for the financial support from the Deutsche Forschungsgemeinschaft (DFG) under the contract number MU 2963/11.


  1. 1.
    Hoch E (2010) Strangpressprofile aus Aluminium-Legierungen für Karosseriebauteile, Automobil Industrie INSIGHT. 42–44Google Scholar
  2. 2.
    Müller K (ed) (2004) Fundamentals of extrusion technology. Giesel Verlag GmbH, IsernhagenGoogle Scholar
  3. 3.
    Sillekens WH, van der Linden DCW, den Bakker AJ (2008) Weld-seam quality of hollow magnesium alloy extrusions. TMS Magnes Technol 2008:189–194Google Scholar
  4. 4.
    Bauser M, Sauer G, Siegert K (2001) Strangpressen. AluminiumVerlag, DüsseldorfGoogle Scholar
  5. 5.
    Donati L, Tomesani L (2005) The effect of die design on the production and seam weld quality of extruded aluminum profiles. J Mater Process Technol 164–165:1025–1031CrossRefGoogle Scholar
  6. 6.
    Donati L, Tomesani L (2004) The prediction of seam welds quality in aluminum extrusion. J Mater Process Technol 153–154:366–373CrossRefGoogle Scholar
  7. 7.
    Liu G, Zhou J, Duszczyk J (2008) FE analysis of metal flow and weld seam formation in a porthole die during the extrusion of a magnesium alloy into a square tube and the effect of ram speed on weld strength. J Mater Process Technol 200:185–198CrossRefGoogle Scholar
  8. 8.
    Hiscocks J, Jiang L, Jonas JJ (2007) Longitudinal seam failure in extruded AZ31 alloy. Adv Mater Res 15–17:439–444CrossRefGoogle Scholar
  9. 9.
    Gensch F, Nitschke R, Gall S, Müller S (2014) Extrusion of hollow magnesium profiles and investigation of extrusion seams. Magnes Technol 2014:257–262Google Scholar
  10. 10.
    Brömmelhoff K, Huppmann M, Reimers W (2011) The effect of heat treatments on the microstructure, texture and mechanical properties of extruded magnesium alloy ME21. Int J Mater Res 102:1133–1141CrossRefGoogle Scholar
  11. 11.
    Huppmann M, Gall S, Müller S, Reimers W (2010) Changes of the texture and the mechanical properties of the extruded Mg alloy ME21 as a function of the process parameters. Mater Sci Eng A 528:342–354CrossRefGoogle Scholar
  12. 12.
    Bohlen J, Yi S, Letzig D, Kainer KU (2010) Effect of rare earth elements on the microstructure and texture development in magnesium-manganese alloys during extrusion. Mater Sci Eng A 527:7092–7098CrossRefGoogle Scholar
  13. 13.
    Gall S, Coelho RS, Müller S, Reimers W (2013) Mechanical properties and forming behavior of extruded AZ31 and ME21 magnesium alloy sheets. Mater Sci Eng A 579:180–187CrossRefGoogle Scholar
  14. 14.
    Li X, Al Samman T, Gottstein G (2011) Microstructure development and texture evolution of ME20 sheets processed by accumulative roll bonding. Mater Lett 65:1907–1910CrossRefGoogle Scholar
  15. 15.
    Gall S, Müller S, Reimers W (2011) Microstructure and mechanical properties of magnesium AZ31 sheets produced by extrusion. Int J Mater Form 6:187–197CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Felix Gensch
    • 1
  • Sven Gall
    • 1
  • Christoph Fahrenson
    • 2
  • Sören Müller
    • 1
  • Walter Reimers
    • 3
  1. 1.TU Berlin, Forschungszentrum StrangpressenBerlinGermany
  2. 2.TU Berlin, Zentraleinrichtung für ElekronenmikroskopieBerlinGermany
  3. 3.TU Berlin, Metallische WerkstoffeBerlinGermany

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