Abstract
The dislocation damping during recovery after quenching has been measured in three austenitic Fe-18Cr alloys containing 10, 15, and 20 pct Ni, respectively. The measurements have been conducted so as to determine the sensitivity of the alloys to the migration of point defects and to establish the role of extended dislocations as point defect sinks. All data have been obtained with samples driven in longitudinal resonance at 80 kHz during recovery anneals at 125°, 150°, and 175°C. The damping decreases during annealing, and analysis of the decrease in terms of a generalized time-dependent damping relation derived from the Granato-Lucke theory indicates that at 1/4 power law is followed. It is shown that these kinetics are consistent with a derived rate law based on the migration of point defects to two-dimensional sinks (extended dislocations) under the influence of a modulus interaction potentialE=-K 5/X 2. the alloys with highest nickel content, and therefore with narrowest extended dislocations, are least affected by the creation and migration of point defects to dislocations.
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