Effect of arc-bending deformation on amplitude-dependent damping in pure magnesium

A processing technology to improve the damping capacity in Mg alloys is studied in this work. The Mg specimens bent on cylinder models and then annealed at 300 °C for 10 h can have a better amplitude-dependent damping property than pure Mg. This arc-bending deformation can be controlled by the number of bending times and cylinder diameter. The arc-bending pure Mg with larger deformation is more significantly affected by heat treatment. A large number of dislocations aligned nearly parallel to each other are observed in the annealed specimens, which cannot be obtained in the annealed and forged Mg. According to the G–L model, the high damping capacity of the specimens profited from the formation of long, parallel dislocation configurations, and barely microscopic configurations impede dislocation movement in the alloy.