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Microchemistry of Proton-Irradiated Austenitic Alloys Under Conditions Relevant to Lwr Core Components

Published online by Cambridge University Press:  15 February 2011

G. S. Was ,
T. R. Allen ,
J. T. Busby ,
J. Gan ,
D. Damcott ,
D. Carter ,
M. Atzmon  and
E. A. Kenik
G. S. Was
Affiliation:
Nuclear Engineering and Radiological Sciences Department, University of Michigan, Ann Arbor, MI 48109, gsw@umich.edu
T. R. Allen
Affiliation:
Nuclear Engineering and Radiological Sciences Department, University of Michigan, Ann Arbor, MI 48109
J. T. Busby
Affiliation:
Nuclear Engineering and Radiological Sciences Department, University of Michigan, Ann Arbor, MI 48109
J. Gan
Affiliation:
Nuclear Engineering and Radiological Sciences Department, University of Michigan, Ann Arbor, MI 48109
D. Damcott
Affiliation:
Nuclear Engineering and Radiological Sciences Department, University of Michigan, Ann Arbor, MI 48109
D. Carter
Affiliation:
Nuclear Engineering and Radiological Sciences Department, University of Michigan, Ann Arbor, MI 48109
M. Atzmon
Affiliation:
Nuclear Engineering and Radiological Sciences Department, University of Michigan, Ann Arbor, MI 48109
E. A. Kenik
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, kenikea@oml.gov
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Abstract

Over 1200 measurements of grain boundary composition and microstructure have been made on 14 different austenitic Fe-Cr-Ni alloys following proton irradiation in the temperature range 200-600°C and in the dose range 0.1-3.0 dpa. Grain boundary composition measurements revealed that Cr depletes at grain boundaries, Ni enriches and Fe can either enrich or deplete depending on alloy composition. Analysis of temperature and composition dependence of RIS revealed that the magnitude and direction of grain boundary segregation depends on alloy composition because the value of migration enthalpy differs among the alloy constituents, and diffusivities of the alloy constituents are composition-dependent. The dose dependence of segregation revealed ordering in Ni-base alloys and temperature dependence was used to show that RIS occurs by vacancy exchange rather than an interstitial binding mechanism. The dependence of segregation on composition is consistent with all known, relevant neutron data.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 540: Symposium N / Microstructural Processes in Irradiated Materials , 1998 , 421
Copyright
Copyright © Materials Research Society 1999

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