Isothermal Fatigue of Magnesium Wrought Alloy AZ31

  1. Prof. Dr.-Ing. K. U. Kainer
  1. Ulf Noster,
  2. Igor Altenberger and
  3. Berthold Scholtes

Published Online: 15 MAY 2006

DOI: 10.1002/3527607552.ch49

Magnesium Alloys and their Applications

Magnesium Alloys and their Applications

How to Cite

Noster, U., Altenberger, I. and Scholtes, B. (2006) Isothermal Fatigue of Magnesium Wrought Alloy AZ31, in Magnesium Alloys and their Applications (ed K. U. Kainer), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607552.ch49

Editor Information

  1. GKSS-Forschungszentrum Geesthacht GmbH, Institut für Werkstofforschung, Max-Planck- Straße, D-21502 Geesthacht, Germany

Author Information

  1. Institute of Materials Technology, University Gh Kassel, Germany

Publication History

  1. Published Online: 15 MAY 2006
  2. Published Print: 20 SEP 2000

ISBN Information

Print ISBN: 9783527302826

Online ISBN: 9783527607556

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Keywords:

  • magnesium alloys;
  • mechanical development;
  • isothermal fatigue;
  • magnesium wrought alloy AZ31

Summary

AZ31 in the as wrought condition shows a distinct anisotropy of deformation and strength, if tension and compression loading is compared. Cyclic deformation behavior in the temperature range between 20 °C and 300 °C was investigated in stress controlled tension-compression tests. With increasing temperature fatigue strength decreases and the damage process shifts from fatigue-controlled to a more creep-controlled mechanism. The asymmetrical deformation behavior leads to cyclic creep for symmetrical cyclic loading. The macroscopically measured deformation was correlated with microstructural observations, in particular, with the extent of deformation twinning. Fatigue strength of AZ31 can be enhanced by mechanical surface treatments, e.g. by shot peening or deep rolling. As a consequence of the induced residual macro and microstress, plastic strain amplitude, which characterizes the fatigue damage process, decreases. Deep rolled AZ31 exhibits also an increase of fatigue strength at higher loading temperatures in comparison to the untreated state, but because of the instability of the induced residual stress and strain hardening, the enhancement is much smaller compared to loading at lower temperatures.