63. Influence of Strain Rate and Temperature on Deformation and Fracture Behaviour of Magnesium Alloy MgAl8Zn: Tests and Numerical Simulations

  1. Prof. Dr. K. U. Kainer
  1. E. El-Magd and
  2. M. Abouridouane

Published Online: 22 APR 2005

DOI: 10.1002/3527603565.ch63

Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications

Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications

How to Cite

El-Magd, E. and Abouridouane, M. (2005) Influence of Strain Rate and Temperature on Deformation and Fracture Behaviour of Magnesium Alloy MgAl8Zn: Tests and Numerical Simulations, in Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications (ed K. U. Kainer), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527603565.ch63

Editor Information

  1. GKSS-Forschungszentrum, Institut für Werkstoffforschung, Max-Planck-Straße, 21502 Geesthacht, Germany

Author Information

  1. Department of Materials Science, RWTH Aachen, Germany

Publication History

  1. Published Online: 22 APR 2005
  2. Published Print: 27 NOV 2003

ISBN Information

Print ISBN: 9783527309757

Online ISBN: 9783527603565

SEARCH

Keywords:

  • magnesium alloy;
  • MgAl8Zn;
  • strain rate;
  • temperature;
  • deformation behaviour;
  • fracture behaviour

Summary

The flow and fracture behaviour of the wrought magnesium alloy MgAl8Zn was investigated by quasi-static and dynamic uniaxial compression and tension tests in the strain rate range of 0.001 s−1equation image ≤ 5000 s−1 and temperatures between 20 °C and 300 °C. Shear tests with hat shaped specimens were carried out by quasi-static and dynamic loading in the shear rate range of 0.01 s−1equation image ≤116000 s−1 and a temperature of 20 °C. Using of experimentally determined stress-strain curves, the effect of strain, strain rate and temperature (strain hardening, strain rate sensitivity and thermal softening) on the stress and the compressive deformation at fracture was determined, showing that both flow stress and the limits of possible deformation are controlled by strain rate and temperature.

The mechanical flow behaviour of the magnesium alloy MgAl8Zn under compression loading at high strain rates was characterised with a constitutive material law under assumption of the domination of damping controlled glide processes, taking the adiabatic behaviour of the deformation process into consideration. Compression, tension and shear tests were simulated by the finite element method in order to validate the used constitutive material law. Metallographic investigations on hat shaped specimens showed shear localization by dynamic loading, which is consent with the numerical simulation results.