Effects of extrusion and equal channel angular pressing on the microstructure, tensile and fatigue behaviour of the wrought magnesium alloy AZ80
Article first published online: 16 AUG 2012
© 2012 Wiley Publishing Ltd.
Fatigue & Fracture of Engineering Materials & Structures
Volume 35, Issue 12, pages 1167–1172, December 2012
How to Cite
FERESHTEH-SANIEE, F., AKBARIPANAH, F., KIM, H.K. and MAHMUDI, R. (2012), Effects of extrusion and equal channel angular pressing on the microstructure, tensile and fatigue behaviour of the wrought magnesium alloy AZ80. Fatigue & Fracture of Engineering Materials & Structures, 35: 1167–1172. doi: 10.1111/j.1460-2695.2012.01713.x
- Issue published online: 20 NOV 2012
- Article first published online: 16 AUG 2012
- Received in final form 18 May 2012
- crack growth;
The microstructure, mechanical properties, fatigue life and fatigue crack propagation rate of Mg-8Al-0.5Zn-0.3Mn (AZ80) magnesium alloy were investigated after extrusion and equal channel angular pressing (ECAP). The highest ultimate and yield strengths and a large enhancement in the fatigue lifetime were obtained after two passes of ECAP. These were decreased with further pressing, although the grain size became finer. There was a correlation between the fatigue and ultimate strengths of AZ80 alloy. The transition from twinning to dislocation slip has also occurred at an average grain size of 7.9 μm. Simultaneous influences of the grain size and the yield strength caused an almost the same threshold of the stress intensity ratio for different process conditions. Moreover, the enhanced ductility of the ECAPed alloy resulted in an increase in the crack growth resistance because of its better ability to accommodate plastic strains during cycling.