Abstract
The internal friction has been measured for dilute NiM alloys (M = Ti, Si, Co, Cr, Cu, Fe, Mn, Pd, V) containing hydrogen over a temperature range from 60 to 400 K. An internal friction peak due to the interaction between substitutional solute atoms and interstitial hydrogen atoms (SI peak, SIP) is observed around 160K except for the NiCo alloy. Detailed measurements have been performed on the NiTi alloy; the binding energy for the TiH pair; evaluated from the solute and hydrogen concentration dependence of the peak height, is smaller than 2 kJ/mol. The relaxation strength of the SIP is comparable to the Snoek peaks in b.c.c. metals, and is closely related to the dilatation of the host Ni lattice by alloying. Below 120 K, a background internal friction is observed in specimens which show the SIP. The background is explained in terms of the magnetomechanical damping accompanied by the hydrogen reorientation around solute atoms under a static stress due to magnetostriction.
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