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The Effect of Migration Energies on Reducing Overprediction in Radiation-Induced Segregation Models

Published online by Cambridge University Press:  16 February 2011

T. R. Allen  and
G. S. Was
T. R. Allen
Affiliation:
Department of Nuclear Engineering, The University of Michigan, Ann Arbor, M1 48109, USA
G. S. Was
Affiliation:
Department of Nuclear Engineering, The University of Michigan, Ann Arbor, M1 48109, USA
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Abstract

Models for calculating radiation-induced segregation (RIS) in concentrated alloys based solely on differences in the magnitude of the vacancy driven flux typically overpredict the amount of grain boundary segregation. A simple sensitivity analysis is used to show that the overprediction may be linked to the choice of input parameters. By varying the Cr-vacancy migration energy from 1.300eV to 1.320 eV and the Fe-vacancy migration energy from1.300eV to 1.305 eV, well within their experimental uncertainty, RIS model calculations are brought into better agreement with AES and STEM-EDS measurements of grain boundary segregation in Fe-Cr-Ni alloys irradiated with protons at 7x 10−6 dpa/s at various temperatures and doses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 373: Symposium Y – Microstructure of Irradiated Materials , 1994 , 101
Copyright
Copyright © Materials Research Society 1995

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References

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