摘要: Abstract An in situ study of prismatic glide beryllium is made to provide a simple model for understanding the anomalous increase elastic limit as function temperature. This effect also observed several ordered alloys such superalloys. In this paper, Part I, mechanism controlling deformation studied at stress peak temperature (300 K). It consists alternate cross-slip events between basal and plane, leading ‘locking-unlocking’ which detail. new appears be variant Peierls mechanism, where screw dislocations exhibit metastable spreading addition classical stable plane. Quantitative measurements give local values parameters (such stress, probabilities locking unlocking strain rate), velocity rate are theoretically expressed. The exact origin anomaly i...
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