Hydrogen-induced internal friction in amorphous and crystalline intermetallic phases

The hydrogen-induced internal friction spectra were studied with the vibrating-reed technique for the phases and microstructures produced during the crystallization sequences of amorphous Co33Zr67, Ni35Zr65 and Ni35Ti65. Several hydrogen relaxation peaks and an additional, drastic effect due to the final precipitation of the NiTi phase in Ni35Ti65 were observed. A closer examination is given to the transformation of the typical hydrogen relaxation in the amorphous state into a grain boundary effect after crystallization, and to the reorientation jumps of the H atoms in the stable, tetragonal C16 phases CoZr2 and NiZr2. (orig.)