Possible nature of oscillations in the time dependences of the internal friction and effective shear modulus in Al-Cu alloys |
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Authors: | A V Oleĭnich-Lysyuk A P Protsyuk |
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Institution: | (1) Fed’kovich National University, ul. Kotsyubinskogo 2, Chernivtsi, 58012, Ukraine |
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Abstract: | The conditions of the appearance of in-phase oscillations in the time dependences of the low-frequency internal friction and effective shear modulus G eff in Al-0.01 wt% Cu and Al-0.001 wt % Cu alloys are studied. The in-phase oscillations are shown to appear in the alloys only when their dislocation-impurity structure is disturbed from equilibrium and the impurity concentration near a dislocation is optimum. This fact suggests that the in-phase oscillations are due to a collective character of dislocation-impurity interactions, which leads to a transfer of energy of translational dislocation motion to transverse dislocation vibrations in the main slip plane. |
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