Abstract
We use the method of inverse torsion pendulum to study the internal friction of samples of iron of different purity and steel subjected to the following procedures of surface treatment: mechanical grinding, hydrogenation, and oil coating. For all treated samples, within the temperature range 100–400°K, we observe complex spectra of internal friction. The character of the relaxation processes running in the subsurface layers of treated specimens is determined by comparing the discovered peaks of internal friction with the available literature data for deformed and hydrogenated iron and steel. The interaction of interstitial atoms with flexible dislocations and migration of kinks on screw dislocations are regarded as possible causes of the formation of peaks of internal friction in oil-coated materials.
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