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.