Defects and impurity centers, dislocations, and physics of strength

Amplitude dependence of the internal friction and Young’s modulus defect of polycrystalline indium

K. V. Sapozhnikov^a, S. N. Golyandin^a, S. B. Kustov<sup>b

a</sup> Ioffe Institute, St. Petersburg
^b Department de Física, Universitat de les Illes Balears, Palma de Mallorca, Spain

Abstract: The dependences of the internal friction and the Young’s modulus defect of polycrystalline indium on the oscillatory strain amplitude have been studied over a wide range of temperatures (7–320 K) and oscillatory strain amplitudes (10$^{-7}$–3.5 $\times$ 10$^{-4}$) at oscillatory loading frequencies of about 100 kHz. It has been revealed that the amplitude dependences of the internal friction and the Young’s modulus defect include stages associated with the interaction of dislocations with point defects and the interdislocation interaction. The temperature range characterized by the formation of point-defect atmospheres (the Cottrell atmospheres) near dislocations in indium has been determined.

Received: 06.05.2009
Accepted: 25.05.2009

 English version: Physics of the Solid State, 2010, 52:1, 43–48

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