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Amplitude Dependent Internal Friction of Magnesium Alloy AZ31 at Room Temperature
Summary
The amplitude-dependent internal friction of magnesium alloy AZ31 was studied at room temperature and 20 kHz, finding that microplastic deformation at small strain amplitudes dominates the damping response. An excited state of the alloy with higher internal friction was identified and associated with dislocation interactions at the microplastic deformation threshold.
The aim of this work is to study the Amplitude Dependent Internal Friction (ADIF) of magnesium alloy AZ31 at room temperature at the frequency 20kHz. The internal friction of AZ31 at room temperature is mostly influenced by mechanical cycling at strain amplitudes in the microplastic deformation region. An excited state of the AZ31 alloy, which can be associated with a higher internal friction and lower dynamic modulus than usual state, was found immediately after mechanical cycling. When the strain amplitude drops, the diffusion of solute atoms restores the Zener atmosphere and the internal friction relaxes exponentially with the second root of time. The measurement methodology and obtained results are presented.
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