A review is given of the internal friction and ultrasonic attenuation investigations made so far on hydrogen charged austenitic stainless steels, high nickel alloys, nickell and copper. The experimental results show that only some forms of hydrogen in f.c.c. metals are of importance for modification of internal friction spectrum: atoms located in the interstices and their pairs, interstitials segregated at the dislocations, and hydrogen bound in hydride and molecular forms. These different hydrogen forms are concluded to affect some already existing anelastic phenomena or to result in appearance of some new processes. © 1990.
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