Abstract
The internal friction and Young's modulus of a hydrogen doped niobium single crystal were measured in the temperature range 20 to 370°K. Nucleation of niobium hydrides is indicated by the growth of an internal friction maximum. The height of the internal friction maximum is proportional to the hydrogen concentration and it shifts progressively to higher temperatures with increasing hydrogen concentration. The activation energy of the peak was found to be about 0·27 eV. From the experimental correlation between temperature and hydrogen concentration at which the peak forms it is possible to deduce the α/α+β solvus. The solvus yields a heat of solution of about 0·12 eV, in agreement with other measurements. Deuterium doped niobium did not yield significantly different results from the ones obtained with hydrogen.
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