Abstract
The effect of aging treatment on fatigue behaviour in extruded Mg alloy AZ80 was investigated. Rotating bending fatigue tests have been performed using as-received, T5 and T6 treated specimens. Due to the aging treatments, Mg_<17>Al_<12> precipitated near grain boundaries and within grains. Both aging treatments could improve the static strengths, but fatigue strength was considerably lowered in T6 condition, while slightly improved in T5 condition. It was indicated that the effect of aging treatment on fatigue strength was mainly attributed to the change in fatigue crack initiation mechanism.
