Internal Friction in the Vanadium-Hydrogen System

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Abstract
Internal friction in a series of V‐H alloys has been measured over the temperature range −190° to +210°C. The hydrogen compositions varied from 1.2 to 14.5 at.% and two frequencies, 75 and 270 cps, were used. For each frequency a single peak was observed having an amplitude which increased essentially linearly with hydrogen concentration. This is suggestive of stress‐induced ordering of the hydrogen atoms in the vanadium‐hydride lattice. Comparison of the activation energy and temperature of this peak with that reported by the authors for the tantalum‐hydrogen system indicates that the hydrogen atoms are located in the tetrahedral interstices.