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Influence of Phase Stability on Radiation Damage Properties: Plutonium-Gallium Alloys

Published online by Cambridge University Press:  01 February 2011

Steve Valone ,
Michael I. Baskes ,
Blas P. Uberuaga ,
Richard L. Martin ,
Alison Kubota  and
Wilhelm G. Wolfer
Steve Valone
Affiliation:
smv@lanl.gov, Los Alamos National Laboratory, Materials Science and Technology Division, Group MST-8, Mail Stop G755, Los Alamos, NM, NM, 87545, United States, 505-667-2067, 505-667-8021
Michael I. Baskes
Affiliation:
baskes@lanl.gov, Los Alamos National Laboratory, Materials Science and Technology Division, Group MST-8, Mail Stop G755, Los Alamos, NM, NM, 87545, United States
Blas P. Uberuaga
Affiliation:
blas@lanl.gov, Los Alamos National Laboratory, Materials Science and Technology Division, Group MST-8, Mail Stop G755, Los Alamos, NM, NM, 87545, United States
Richard L. Martin
Affiliation:
rlmartin@lanl.gov, Los Alamos National Laboratory, Theoretical Division, Group T-12, Mail Stop B268, Los Alamos, NM, NM, 87545, United States
Alison Kubota
Affiliation:
kubota1@llnl.gov, Lawrence Livermore National Laboratory, Livermore, CA, CA, 94550, United States
Wilhelm G. Wolfer
Affiliation:
wolfer1@llnl.gov, Lawrence Livermore National Laboratory, Livermore, CA, CA, 94550, United States
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Abstract

Modeling cascade and fission damage evolution of actinide materials of all kinds is essential for understanding their aging characteristics. As an example of how exotic some of the damage evolution behavior can be, plutonium-gallium (Pu-Ga) alloys in the δ-phase (fcc lattices) are explored. Aging emanates from the wide variety of spontaneous decay and fission products that, in the case of the Pu, are such species as helium (He) and uranium, among others, as well as interstitials, and vacancies. To aid in our understanding, the modified embedded atom method (MEAM) formalism is applied to the Pu-Ga-He system. The behavior of defects in the fcc (δ) phase of Pu-based materials is strongly influenced by the metastability of this phase. The influence of this metastability on minimum displacement threshold energy, point defect characteristics and He bubbles is delineated. The roles of short-range ordering and transformations of voids into stacking fault tetrahedra in the aging process are also examined.

Keywords

radiation effectssimulationactinide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1043: Symposium T – Materials Innovations for Next-Generation Nuclear Energy , 2007 , 1043-T04-03
Copyright
Copyright © Materials Research Society 2008

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