Microyielding and damping capacity in magnesium

The damping capacity and mechanical response under uniaxial tension and compression were examined for specimens of extruded magnesium inclined by 0°, 15° and 30° relative to the extrusion direction. It was found that both the microyielding under uniaxial deformation and the occurrence of strain-dependent damping capacity pertain to the same physical event: the breaking away of basal 〈a〉 dislocations from weak pinning points and the subsequent sweeping motion of dislocations between strong pinning points.