DISLOCATION RELAXATION PEAKS IN TANTALUM, INTRINSIC AND IMPURITY DEPENDENT EFFECTS
U. Rodrian, H. Schultz · Le Journal de Physique Colloques · 1981
Investigations of the dislocation relaxation peaks in high purity and oxygen doped tantalum single crystals were carried out in the temperature range between 20 K and 700 K. The observed effects can be divided into 3 groups : the hydrogen Snoek-Köster relaxation (αH) between 50 K - 250 K, the γ-relaxation between 350 K - 500 K, and an oxygen Snoek-Köster peak (S.K.P.) above 500 K for a measuring frequency of about 1 Hz. Only the effects above 300 K will be discussed here. The γ-relaxation consists of 2 subpeaks γ1 and γ2 which are related to the intrinsic dislocation motion and an interaction of dislocations with interstitial oxygen respectively. The S.K.P. is discussed with regard to a new suggestion of A. Seeger.