Amplitude Dependent Inelasticity in Undoped Polycrystalline Germanium

Amplitude dependence of internal friction and shear modulus of undoped polycrystalline germanium have been investigated. Maxima of internal friction and shear modulus defects are observed at low and high amplitudes of oscillation deformation at different fixed temperatures. It is supposed that they are caused by breakaway of geometric kinks and segments from the pinning points on the 60 0 -edge dislocations in germanium. © 2010 Bull. Georg. Natl. Acad. Sci.