Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 444, Issue -, Pages 305-309Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2006.10.156
Keywords
actinide alloys and compounds; radiation effects; crystal structure; positron spectroscopies; molecular dynamics simulation
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The plutonium a-decay leads to the formation of numerous defects, which affect physical properties. This work presents swelling measured both at the macroscopic and microscopic scales on delta-Pu alloys, together with a characterization of defects by positron annihilation spectroscopy (PAS). Swelling seems to depend on deltagen element and/or on alpha-decay rate, and differences are observed between macroscopic and microscopic swelling. PAS results suggest that the concentration of vacancy clusters increases at the early stages of aging. Simulation of displacement cascades performed by molecular dynamics revealed a very long time (a couple of nanoseconds) to reach thermalization, contrary to what is observed in other fee metals. (c) 2006 Elsevier B.V. All rights reserved.
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