Abstract
The amplitude-dependent internal friction of continuously-cast and rolled AZ31 magnesium alloy was measured in this study. Samples were annealed and quenched step by step; immediately after the treatment, the amplitude dependence of the logarithmic decrement was measured. Changes in the microstructure due to thermomechanical treatment were reflected in changes in the damping. Internal friction is influenced by the dislocation substructure and its modification due to solute atoms migration, microplastic deformation, and twins’ formation. Internal friction in the rolled sheets is affected by the rolling texture.
Highlights
The amplitude-dependent internal friction (ADIF) is usually explained by the Granato and Lücke model (G-L model)
Grain-refined cast magnesium alloy AZ31 was quenched into water of ambient temperature with increasing annealing upper temperatures up to 400 ◦ C
The amplitude dependent internal friction was measured at room temperature on both alloys and the following main results were obtained:
Summary
The amplitude-dependent internal friction (ADIF) is usually explained by the Granato and Lücke model (G-L model) This model in its original form, published in the 1950s [1,2], was constructed for “pure“ metals loaded at very low temperatures; for movable dislocations in the slip plane and their break-away from the static pinning points (usually solute atoms, point defects or their small clusters). Authors of many papers concerning ADIF usually apply the original G-L model in the simplest form and, in the case of concentrated alloys [11], sometimes this model is not applicable This depends on the material microstructure, mobility of solute atoms, their distribution (isolated solute atoms, their small clusters, precipitates, particles of the second phase)
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