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Title: Void nucleation at elevated temperatures under cascade-damage irradiation
Authors: Semenov, A. A.
Woo, Chung-ho
Subjects: Irradiation
Neutron
Radiation dose
Temperature dependence
Issue Date: 1-Jul-2002
Publisher: American Physical Society
Citation: Physical review B, condensed matter and materials physics, 1 July 2002, v. 66, no. 2, 024118, p. 1-10.
Abstract: The effects on void nucleation of fluctuations respectively due to the randomness of point-defect migratory jumps, the random generation of free point defects in discrete packages, and the fluctuating rate of vacancy emission from voids are considered. It was found that effects of the cascade-induced fluctuations are significant only at sufficiently high total sink strength. At lower sink strengths and elevated temperatures, the fluctuation in the rate of vacancy emission is the dominant factor. Application of the present theory to the void nucleation in annealed pure copper neutron-irradiated at elevated temperatures with doses of 10-4–10-2 NRT dpa showed reasonable agreement between theory and experiment. This application also predicts correctly the temporal development of large-scale spatial heterogeneous microstructure during the void nucleation stage. Comparison between calculated and experimental void nucleation rates in neutron-irradiated molybdenum at temperatures where vacancy emission from voids is negligible showed reasonable agreement as well. It was clearly demonstrated that the athermal shrinkage of relatively large voids experimentally observable in molybdenum at such temperatures may be easily explained in the framework of the present theory.
Description: DOI: 10.1103/PhysRevB.66.024118
Rights: Physical Review B © 2002 The American Physical Society. The Journal's web site is located at http://prb.aps.org/
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/4740
ISSN: 1098-0121 (print)
1550-235X (online)
Appears in Collections:ME Journal/Magazine Articles

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