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Title: Modeling radiation induced segregation in Iron-Chromium alloys

Journal Article · · Acta Materialia
 [1];  [1];  [2];  [1];  [1];  [3]
  1. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. SIMAP, Cedex (France)

Radiation induced segregation in ferritic Fe-Cr alloys is studied by Atomistic Kinetic Monte Carlo simulations that include di usion of chemical species by vacancy and interstitial migration, recombination, and elimination at sinks. The parameters of the di usion model are tted to DFT calculations. Transport coe cients that control the coupling between di usion of defects and chemical species are measured in dilute and concentrated alloys. Radiation induced segregation near grain boundaries is directly simulated with this model. We nd that the di usion of vacancies toward sinks leads to a Cr depletion. Meanwhile, the di usion of self-interstitials causes an enrichment of Cr in the vicinity of sinks. For concentrations lower than 15%Cr, we predict that sinks will be enriched with Cr for temperatures lower than a threshold. When the temperature is above this threshold value, the sinks will be depleted in Cr. These results are compared to previous experimental studies and models. Cases of radiation induced precipitation and radiation accelerated precipitation are considered.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1335617
Alternate ID(s):
OSTI ID: 1397671
Report Number(s):
LA-UR-15-28564
Journal Information:
Acta Materialia, Vol. 103; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 55 works
Citation information provided by
Web of Science

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Cited By (6)

Role of Sink Density in Nonequilibrium Chemical Redistribution in Alloys journal March 2018
α′ formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys journal June 2019
Mechanism of nucleation and incipient growth of Re clusters in irradiated W-Re alloys from kinetic Monte Carlo simulations journal September 2017
Continuum Separation of Nanoscale Phase in Thermal Aging Fe-Cr Alloys: Phase-Field Simulation and Experiment journal February 2019
Radiation Tolerance in Nano-Structured Crystalline Fe(Cr)/Amorphous SiOC Composite journal March 2019
Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys journal December 2017