On the Fatigue Behaviour of Wrought Magnesium Alloys*

Abstract

Abstract The influence of crystallographic texture on the mechanical properties of magnesium alloys is already well-known. However, it is not clear how the crystallographic texture affects the fatigue properties in the sense of cyclic deformation behaviour of magnesium alloys. The objective of this study is to investigate and compare the deformation processes of the extruded magnesium alloys AZ31 and AZ80 during static and cyclic tensile testing. The influence of the loading condition and chemical composition on the evolution of the microstructure and the crystallographic texture has been observed. Changes of the plastic strain have been observed and have been interpreted for both AZ alloys with cyclic hardening curves. However, the maximal stress during the fatigue test was higher than the TYS for both alloys. Both experimental materials exhibited significant lower plastic deformations and lower density of tensile twins compared to static tensile test. The microstructure and texture analyses have been performed before and after experiments.