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Grain boundary character dependence of radiation-induced segregation in a model Ni–Cr alloy

Published online by Cambridge University Press:  05 March 2015

Christopher M. Barr ,
Leland Barnard ,
James E. Nathaniel ,
Khalid Hattar ,
Kinga A. Unocic ,
Izabela Szlurfarska ,
Dane Morgan  and
Mitra L. Taheri
Christopher M. Barr
Affiliation:
Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
Leland Barnard
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA
James E. Nathaniel
Affiliation:
Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
Khalid Hattar
Affiliation:
Radiation Solid-Interactions Group, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
Kinga A. Unocic
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratories, Oak Ridge, Tennessee 37831, USA
Izabela Szlurfarska
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA; and Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706, USA
Dane Morgan
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA; and Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706, USA
Mitra L. Taheri*
Affiliation:
Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
*
b)Address all correspondence to this author. e-mail: mtaheri@coe.drexel.edu
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Abstract

Ni-based fcc alloys are frequently used as critical structural materials in nuclear energy applications. Despite extensive studies, fundamental questions remain regarding point defect migration and solute segregation as a function of grain boundary character after irradiation. In this study, a coupled experimental and modeling approach is used to understand the response of grain boundary character in a model Ni–5Cr alloy after high temperature heavy-ion irradiation. Radiation-induced segregation and void denuded zones were experimentally examined as a function of grain boundary character, while a kinetic rate theory model with grain boundary character boundary conditions was used to theoretically model Cr depletion in the alloy system. The results highlight major variations in the radiation response between the coherent and incoherent twin grain boundaries, but show limited disparity in defect sink strength between random low- and high-angle grain boundary regimes.

Keywords

grain boundariesradiation effectsnuclear materials
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 9: Focus Issue: Characterization and Modeling of Radiation Damage on Materials: State of the Art, Challenges, and Protocols , 14 May 2015 , pp. 1290 - 1299
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Joel Ribis

a)

This author was an editor of this focus issue during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr-editor-manuscripts/.

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