Deformation processes in refractory metals. Progress report, December 1, 1975--November 30, 1976

Two papers were published during the report period. Abstracts of these papers are included. Four others have been accepted for publication and are abstracted in included sections. In addition to this, Mr. Juan Donoso has published a dissertation which is summarized. A paper is presented which was prepared for presentation at the ''Interstitial Effects in Refractory Metals'' session of the Fall AIME meeting in Niagara Falls, New York. Other work currently under way is discussed, including new internal friction determinations of the diffusion coefficients of O and N in niobium and re-evaluation of the available relevant data in the literature. It is believed that the results of this study make it possible to rationalize apparent inconsistencies in the literature. Work on the static strain-aging in Ti is reported. A review of work on the effects of hydrogen on the yield point phenomena in niobium at the temperatures 273 and 1930K is presented along with transmission electron microscopy work on titanium aimed at obtaining a better insight into the causes of anomalous work hardening associated with dynamic strain-aging in this metal