skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A combined APT and SANS investigation of α' phase precipitation in neutron-irradiated model FeCrAl alloys

Journal Article · · Acta Materialia

Here, FeCrAl alloys are currently under consideration for accident-tolerant fuel cladding applications in light water reactors owing to their superior high-temperature oxidation and corrosion resistance compared to the Zr-based alloys currently employed. However, their performance could be limited by precipitation of a Cr-rich α' phase that tends to embrittle high-Cr ferritic Fe-based alloys. In this study, four FeCrAl model alloys with 10–18 at.% Cr and 5.8–9.3 at.% Al were neutron-irradiated to nominal damage doses up to 7.0 displacements per atom at a target temperature of 320 °C. Small angle neutron scattering techniques were coupled with atom probe tomography to assess the composition and morphology of the resulting α' precipitates. It was demonstrated that Al additions partially destabilize the α' phase, generally resulting in precipitates with lower Cr contents when compared with binary Fe-Cr systems. The precipitate morphology evolution with dose exhibited a transient coarsening regime akin to previously observed behavior in aged Fe-Cr alloys. Similar behavior to predictions of the LSW/UOKV models suggests that α' precipitation in irradiated FeCrAl is a diffusion-limited process with coarsening mechanisms similar to those in thermally aged high-Cr ferritic alloys.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Nuclear Science User Facility (NSUF)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC05-00OR22725; AC07-051D14517
OSTI ID:
1350922
Alternate ID(s):
OSTI ID: 1397851
Journal Information:
Acta Materialia, Vol. 129, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 96 works
Citation information provided by
Web of Science

References (63)

High temperature oxidation of fuel cladding candidate materials in steam–hydrogen environments journal September 2013
Materials challenges in nuclear energy journal February 2013
Designing Radiation Resistance in Materials for Fusion Energy journal July 2014
Scoping assessments of ATF impact on late-stage accident progression including molten core–concrete interaction journal May 2014
Uniform corrosion of FeCrAl alloys in LWR coolant environments journal October 2016
Development and property evaluation of nuclear grade wrought FeCrAl fuel cladding for light water reactors journal December 2015
Microstructural stability of Fe–Cr–Al alloys at 450–550 °C journal February 2015
Mechanical properties of neutron-irradiated model and commercial FeCrAl alloys journal June 2017
Deformation behavior of laser welds in high temperature oxidation resistant Fe–Cr–Al alloys for fuel cladding applications journal November 2014
Void-swelling in irons and ferritic steels journal November 1979
Void-swelling in irons and ferritic steels journal November 1979
Dislocation loops and bubbles in oxide dispersion strengthened ferritic steel after helium implantation under stress journal January 2008
Radiation tolerance of neutron-irradiated model Fe–Cr–Al alloys journal October 2015
Irradiation-enhanced α′ precipitation in model FeCrAl alloys journal April 2016
Neutronic analysis of candidate accident-tolerant cladding concepts in pressurized water reactors journal January 2015
Screening of advanced cladding materials and UN–U3Si5 fuel journal July 2015
On the α–α′ miscibility gap of Fe–Cr alloys journal December 2008
Neutron small-angle scattering study of unmixing in FeCr alloys journal July 1992
α′ precipitation in neutron-irradiated Fe–Cr alloys journal March 2014
A SANS investigation of the irradiation-enhanced α–α′ phases separation in 7–12 Cr martensitic steels journal February 2003
Atomic scale analysis and phase separation understanding in a thermally aged Fe–20at.%Cr alloy journal February 2009
Kinetics of α′ precipitation in an electron-irradiated Fe15Cr alloy journal September 2016
Cr precipitation in neutron irradiated industrial purity Fe–Cr model alloys journal January 2013
Microstructural evolution of Fe 22%Cr model alloy under thermal ageing and ion irradiation conditions studied by atom probe tomography journal August 2016
Estimation of the solubility limit of Cr in Fe at 300°C from small-angle neutron scattering in neutron-irradiated Fe–Cr alloys journal December 2009
Atom probe study of irradiation-enhanced α′ precipitation in neutron-irradiated Fe–Cr model alloys journal July 2015
Mapping of 475°C embrittlement in ferritic Fe–Cr–Al alloys journal November 2010
Phase separation in PM 2000™ Fe-base ODS alloy: Experimental study at the atomic level journal August 2008
Aluminum partitioning during phase separation in Fe–20%Cr–6%Al ODS alloy journal June 2008
Phase separation kinetics in a Fe–Cr–Al alloy journal July 2012
Experimental observations in support of the dynamic-segregation theory to explain the reactive-element effect journal February 1996
Method for analyzing passive silicon carbide thermometry with a continuous dilatometer to determine irradiation temperature
  • Campbell, Anne A.; Porter, Wallace D.; Katoh, Yutai
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 370 https://doi.org/10.1016/j.nimb.2016.01.005
journal March 2016
Atom probe specimen preparation with a dual beam SEM/FIB miller journal September 2007
LAMDA: Irradiated-Materials Microscopy at Oak Ridge National Laboratory journal August 2015
A procedure for quantification of precipitate microstructures from three-dimensional atom probe data journal May 2003
Aspects of the observation of clusters in the 3-dimensional atom probe journal January 2007
New Techniques for the Analysis of Fine-Scaled Clustering Phenomena within Atom Probe Tomography (APT) Data journal November 2007
Applications of atom-probe tomography to the characterisation of solute behaviours journal July 2010
Quantitative atom probe tomography characterization of microstructures in a proton irradiated 304 stainless steel journal August 2014
Comparison of Compositional and Morphological Atom-Probe Tomography Analyses for a Multicomponent Fe-Cu Steel journal July 2007
Orientation relationships and interface structure of α′-Cr nanoclusters embedded in α-Fe matrix after α–α′ demixing in neutron irradiated Oxide Dispersion Strengthened material journal May 2012
The 40 m general purpose small-angle neutron scattering instrument at Oak Ridge National Laboratory journal August 2012
Analysis of Three-dimensional Atom-probe Data by the Proximity Histogram journal September 2000
Influence of recrystallization on phase separation kinetics of oxide dispersion strengthened Fe–Cr–Al alloy journal March 2012
New computational method in the theory of spinodal decomposition journal April 1975
SANS investigation of a neutron-irradiated Fe–9at%Cr alloy journal December 2010
SANS investigation of microstructure evolution in high chromium ODS steels after thermal ageing journal April 2013
Analysis of small-angle scattering data from colloids and polymer solutions: modeling and least-squares fitting journal July 1997
Determination of size distribution from small-angle scattering data for systems with effective hard-sphere interactions journal August 1994
Small-angle scattering from precipitates: Analysis by use of a polydisperse hard-sphere model journal January 1993
Small-angle scattering from a commercial Al-Li alloy journal October 1989
Characterization of neutron-irradiated ferritic model alloys and a RPV steel from combined APT, SANS, TEM and PAS analyses journal November 2010
Uncertainties and assumptions associated with APT and SANS characterisation of irradiation damage in RPV steels journal June 2014
Atom probe tomography of reactor pressure vessel steels: An analysis of data integrity journal May 2011
Microstructural changes in a neutron-irradiated Fe–15 at.%Cr alloy journal November 2014
Microstructural changes in a neutron-irradiated Fe–6 at.%Cr alloy journal October 2014
Microstructural evolution of ferritic-martensitic steels irradiated in the fast breeder reactor Phénix journal October 1993
Work-hardening and work-softening of face-centred cubic metal crystals journal March 1957
The relationship between hardness and yield stress in irradiated austenitic and ferritic steels journal February 2005
Ostwald ripening in multicomponent alloys journal October 1993
Ostwald ripening in ternary alloys journal April 1996
The kinetics of precipitation from supersaturated solid solutions journal April 1961
Modelling the overlap of nucleation, growth and coarsening during precipitation journal September 2004

Cited By (5)

Quantitative Phase-Field Simulation of Composition Partition and Separation Kinetics of Nanoscale Phase in Fe-Cr-Al Alloy journal May 2019
Review of the Quench Sensitivity of Aluminium Alloys: Analysis of the Kinetics and Nature of Quench-Induced Precipitation journal December 2019
α′ formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys journal June 2019
Magnetic small-angle neutron scattering journal March 2019
The Effect of a Two-Stage Heat-Treatment on the Microstructural and Mechanical Properties of a Maraging Steel. text January 2017