Internal Friction in the Vanadium-Hydrogen System

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.