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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

Abstract

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.

Keywords

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.

Notes

Acknowledgements

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

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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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