Internal Friction Peaks Caused by Deformation in Ta and Nb.

Internal friction peaks in Ta and Nb which arise after these metals have undergone cold-work are observed at temperatures between 200°C and 300°C for a frequency of 1 cps. Numerous similarities of the peak in Ta to one reported by Schoeck and Mondino are observed, but some differences are also observed. The peaks in both metals anneal away rapidly at their maxima, making quantitative measurement of their properties difficult. These peaks may be caused by an oxygen-dislocation interaction, as was suggested by Schoeck and Mondino, but several differences between these peaks and other cold-work peaks make this assignment not certain.