Abstract
Magnesium cast parts as well as indirectly and hydrostatically extruded profiles were used in
order to investigate the influence of different microstructures on the damping behaviour of magnesium
AZ-alloys. Especially, hydrostatic extrusion leads to a significant grain refinement in the extruded
profile compared to indirect extrusion. Strain dependent damping measurements were carried out at
room temperature using alloys AZ31, AZ61 and AZ80. Damping was determined as the logarithmic
decrement of free bending beam vibrations. The results of these measurements after indirect and
hydrostatic extrusion are shown and discussed.