
Yield stress measurements have been performed on irradiated and annealed-irradiated high purity (5 wt ppm interstitials) and intermediate purity (27 wt ppm interstitials) molybdenum single crystals of (100), (110), and (491) orientations. Radiation anneal hardening which is the additional increment in yield stress over that observed in irradiated samples was observed for all orientations. Radiation anneal hardening was smaller in samples with the higher impurity interstitial concentration. The proposed mechanism, therefore, for the observed anneal hardening is the migration of self interstitials to the radiation produced defect clusters. An bestrahlten und bestrahlten-getemperten, hochreinen (5 Gew.ppm Zwischengitterplatze) Molybdaneinkristallen und Molybdaneinkristallen mittlerer Reinheit (27 Gew.ppm Zwischengitterplatze) mit (100)-, (110)- und (491)-Orientierung wurden Streckgrenzenmessungen durchgefuhrt. Bestrahlungsausheilhartung, die den zusatzlichen Zuwachs der Streckgrenze uber die in bestrahlten Proben beobachtete darstellt, wurde fur alle Orientierungen beobachtet. Die Bestrahlungsausheilhartung war in Proben mit hoherer Stor-stellenzwischengitterkonzentration geringer. Der vorgeschlagene Mechanismus fur die beobachtete Ausheilhartung ist deshalb die Wanderung der Eigenzwischengitterfehler zu den bestrahlungsinduzierten Storstellenagglomeraten.
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