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Title: Dependence of Grain Boundary Structure on Radiation Induced Segregation and Void Denuded Zones in a Model Ni-Cr Alloy.

Abstract

Abstract not provided.

Authors:
;  [1]; ;  [2];  [1];  [3];  [4]
  1. (University of Wisconsin)
  2. (Oak Ridge National Laboratory)
  3. (Drexel University)
  4. (Drexel)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1399305
Report Number(s):
SAND2016-10004C
648047
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the The Rio Grande Symposium on Advanced Materials held October 3, 2016 in Albuquerque, NM, United States of America.
Country of Publication:
United States
Language:
English

Citation Formats

Barr, Christopher Michael, Barnard, Leland, Hattar, Khalid Mikhiel, Kinga Unocic, Morgan, Dane, Taheri, Mitra, and Barr, Christopher. Dependence of Grain Boundary Structure on Radiation Induced Segregation and Void Denuded Zones in a Model Ni-Cr Alloy.. United States: N. p., 2016. Web.
Barr, Christopher Michael, Barnard, Leland, Hattar, Khalid Mikhiel, Kinga Unocic, Morgan, Dane, Taheri, Mitra, & Barr, Christopher. Dependence of Grain Boundary Structure on Radiation Induced Segregation and Void Denuded Zones in a Model Ni-Cr Alloy.. United States.
Barr, Christopher Michael, Barnard, Leland, Hattar, Khalid Mikhiel, Kinga Unocic, Morgan, Dane, Taheri, Mitra, and Barr, Christopher. Sat . "Dependence of Grain Boundary Structure on Radiation Induced Segregation and Void Denuded Zones in a Model Ni-Cr Alloy.". United States. doi:. https://www.osti.gov/servlets/purl/1399305.
@article{osti_1399305,
title = {Dependence of Grain Boundary Structure on Radiation Induced Segregation and Void Denuded Zones in a Model Ni-Cr Alloy.},
author = {Barr, Christopher Michael and Barnard, Leland and Hattar, Khalid Mikhiel and Kinga Unocic and Morgan, Dane and Taheri, Mitra and Barr, Christopher},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 2016},
month = {Sat Oct 01 00:00:00 EDT 2016}
}

Conference:
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  • Ferritic/Martensitic (F/M) steels with high Cr content posses the high temperature strength and low swelling rates required for advanced nuclear reactor designs. Radiation induced segregation (RIS) occurs in F/M steels due to solute atoms preferentially coupling to point defect fluxes to defect sinks, such as grain boundaries (GBs). The RIS response of F/M steels and austenitic steels has been shown to be dependent on the local structure of GBs but has only been demonstrated in ion irradiated specimens. A 9 wt. % Cr model alloy steel was irradiated to 3 dpa using neutrons at the Advanced Test Reactor (ATR) tomore » determine the effect of neutron radiation environment on the RIS-GB structure dependence. This investigation found the relationship between GB structure and RIS is also active for F/M steels irradiated using neutrons. The data generated from the neutron irradiation is also compared to RIS data generated using proton irradiations on the same heat of model alloy.« less
  • The authors have investigated the solute segregation and simultaneous evolution of extended defects in an Fe-Cr-Ni alloy during irradiation by computer simulation. It sheds a light on the accomplishment of performing the combined total calculation or the multiscale modeling which deals with both radiation-induced segregation and various kinds of internal sink evolution. The formation of dislocation-free zone (DLFZ) was predicted in the vicinity of a grain boundary. It indicated that DLFZ formation is controlled by solute diffusional process via point defects diffusion near the grain boundary and the activation energy obtained by the width of DLFZ corresponds to the halfmore » of the value of the radiation-enhanced solute diffusivity.« less
  • Solute transport by radiation-induced segregation (RIS) leads to local changes of alloy composition. We have studied RIS in a binary Ni-8 at. % Si alloy by 7-MeV-proton and 28-MeV-alpha particle irradiations. Damage levels varied between 0.1 and 0.3 dpa. The irradiations were carried out at 475/sup 0/C, the expected peak RIS temperature; preimplantation of helium at 700/sup 0/C was carried out in some specimens. Solute segregation was studied by energy-dispersive x-ray analysis (EDX). Using very fine electron-beam probes of 2 nm diameter from a high-brightness field-emission source, microchemical profiles across the grain boundaries were measured. Radiation-induced precipitation of Ni/sub 3/Simore » was investigated by dark-field transmission electron microscopy (TEM).« less
  • When alloys based on the Fe-Ni-Cr system are subjected to irradiation at high temperatures a substantial amount of elemental segregation occurs. Two categories of segregation have been observed, one involving radiation-induced precipitation or changes in precipitate composition, and another involving the establishment of compositional gradients near microstructural sinks. While segregation into precipitate phases is known to strongly influence the development of void swelling, it now appears that segregation to void surfaces plays an equally important role of nickel as a primary segregant. An investigation of the basic flux equations for diffusion of interstitials and vacancies in superimposed strain and compositionmore » gradients shows that several previously unconsidered drift terms arise in the description of the bias as a result of elemental segregation. These terms originate from the compositional dependence of point defect formation and migration energies and the compositional dependence of elastic properties and lattice parameter. When compounded with the operation of the inverse Kirkendall segregation mechanism, these terms strongly alter the bias for void nucleation and growth and provide an explanation for the marked variation of void nucleation and swelling with nickel concentrations. The segregation-induced drift terms are comparable in magnitude to the strain-induced drift terms and are strongly dependent on nickel concentration. This is demonstrated for binary Fe-Ni alloys using published tracer diffusion and thermodynamic data.« less