Multiscale investigations of nanoprecipitate nucleation, growth, and coarsening in annealed low-Cr oxide dispersion strengthened FeCrAl powder

Caleb P. Massey; Sebastien N. Dryepondt; Philip D. Edmondson; Matthew G. Frith; Kenneth C. Littrell; Anoop Kini; Baptiste Gault; Kurt A. Terrani; Steven J. Zinkle

doi:10.1016/j.actamat.2018.11.062

Multiscale investigations of nanoprecipitate nucleation, growth, and coarsening in annealed low-Cr oxide dispersion strengthened FeCrAl powder

Caleb P. Massey, Sebastien N. Dryepondt, Philip D. Edmondson, Matthew G. Frith, Kenneth C. Littrell, Anoop Kini, Baptiste Gault, Kurt A. Terrani, Steven J. Zinkle

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

Abstract

A major challenge in the design of oxide dispersion strengthened (ODS) FeCrAl alloys is the optimization of the fine-scale particle size distribution that provides both beneficial mechanical properties and irradiation resistance. To address this obstacle, the nucleation, growth, and coarsening of the fine-scale (Y,Al,O) nanoprecipitates within an ODS FeCrAl powder was studied using atom probe tomography (APT) and small-angle neutron scattering (SANS). Mechanically alloyed Fe–10Cr-6.1Al-0.3Zr + Y₂O₃ wt.% (CrAZY) powders were heated in-situ from 20 to 1000 °C to capture the nucleation and growth of the nanoprecipitates using SANS. Furthermore, CrAZY powders were annealed at 1000 °C, 1050 °C, and 1100 °C for ageing times from 15 min to 500 h followed by either APT or magnetic SANS to study the structure, composition, and coarsening kinetics of the nanoprecipitates at high temperature. In-situ SANS results indicate nanoprecipitate nucleation and growth at low temperatures (200–600 °C). APT results revealed compositions corresponding to the cubic Y₃Al₅O₁₂ garnet (YAG) stoichiometry with a possible transition towards the perovskite YAlO₃ (YAP) phase for larger precipitates after sufficient thermal ageing. However, magnetic SANS results suggest a defective structure for the nanoprecipitates indicated by deviations of the calculated A-ratio from stoichiometric (Y,Al,O) phases. Particle coarsening kinetics follow n = 6 power law kinetics with respect to particle size, but the mechanism cannot be explained through the dislocation pipe diffusion mechanism. The potential effect of precipitate coarsening during pre- and post-consolidation heat treatments on the irradiation resistance of ODS FeCrAl alloys is discussed with respect to sink strength maximization.

Original language	English
Pages (from-to)	1-17
Number of pages	17
Journal	Acta Materialia
Volume	166
DOIs	https://doi.org/10.1016/j.actamat.2018.11.062
State	Published - Mar 2019

Bibliographical note

Publisher Copyright:
© 2018 Acta Materialia Inc.

Funding

This work was funded primarily by the Office of Fusion Energy Sciences . Neutron scattering experiments were performed at the High-Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) under proposals 18169.1 and 20093.1. A portion of the atom probe tomography was obtained at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This material is based upon work supported under a Department of Energy Nuclear Energy University Programs (NEUP) Graduate Fellowship. The authors acknowledge and thank Gregory Cox and Tom Geer for their efforts in this project. A special thanks is also extended to Kevin Field and Brian Wirth for their insightful discussions on the subject over the course of this project. An acknowledgement is also extended to Lisa Debeer-Schmitt for helping to facilitate the SANS data acquisition. This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).This work was funded primarily by the Office of Fusion Energy Sciences. Neutron scattering experiments were performed at the High-Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) under proposals 18169.1 and 20093.1. A portion of the atom probe tomography was obtained at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This material is based upon work supported under a Department of Energy Nuclear Energy University Programs (NEUP) Graduate Fellowship. The authors acknowledge and thank Gregory Cox and Tom Geer for their efforts in this project. A special thanks is also extended to Kevin Field and Brian Wirth for their insightful discussions on the subject over the course of this project. An acknowledgement is also extended to Lisa Debeer-Schmitt for helping to facilitate the SANS data acquisition.

Funders	Funder number
DOE Office of Nuclear Energy
U.S. Department of Energy
Fusion Energy Sciences
Nuclear Energy University Program

Keywords

Atom probe tomography
Oxide dispersion strengthened (ODS) alloy
Precipitation
Small angle neutron scattering

Access to Document

10.1016/j.actamat.2018.11.062

Cite this

@article{fc8eb775c4cc4b3f908f224f9923ff8d,

title = "Multiscale investigations of nanoprecipitate nucleation, growth, and coarsening in annealed low-Cr oxide dispersion strengthened FeCrAl powder",

abstract = "A major challenge in the design of oxide dispersion strengthened (ODS) FeCrAl alloys is the optimization of the fine-scale particle size distribution that provides both beneficial mechanical properties and irradiation resistance. To address this obstacle, the nucleation, growth, and coarsening of the fine-scale (Y,Al,O) nanoprecipitates within an ODS FeCrAl powder was studied using atom probe tomography (APT) and small-angle neutron scattering (SANS). Mechanically alloyed Fe–10Cr-6.1Al-0.3Zr + Y2O3 wt.% (CrAZY) powders were heated in-situ from 20 to 1000 °C to capture the nucleation and growth of the nanoprecipitates using SANS. Furthermore, CrAZY powders were annealed at 1000 °C, 1050 °C, and 1100 °C for ageing times from 15 min to 500 h followed by either APT or magnetic SANS to study the structure, composition, and coarsening kinetics of the nanoprecipitates at high temperature. In-situ SANS results indicate nanoprecipitate nucleation and growth at low temperatures (200–600 °C). APT results revealed compositions corresponding to the cubic Y3Al5O12 garnet (YAG) stoichiometry with a possible transition towards the perovskite YAlO3 (YAP) phase for larger precipitates after sufficient thermal ageing. However, magnetic SANS results suggest a defective structure for the nanoprecipitates indicated by deviations of the calculated A-ratio from stoichiometric (Y,Al,O) phases. Particle coarsening kinetics follow n = 6 power law kinetics with respect to particle size, but the mechanism cannot be explained through the dislocation pipe diffusion mechanism. The potential effect of precipitate coarsening during pre- and post-consolidation heat treatments on the irradiation resistance of ODS FeCrAl alloys is discussed with respect to sink strength maximization.",

keywords = "Atom probe tomography, Oxide dispersion strengthened (ODS) alloy, Precipitation, Small angle neutron scattering",

author = "Massey, {Caleb P.} and Dryepondt, {Sebastien N.} and Edmondson, {Philip D.} and Frith, {Matthew G.} and Littrell, {Kenneth C.} and Anoop Kini and Baptiste Gault and Terrani, {Kurt A.} and Zinkle, {Steven J.}",

note = "Publisher Copyright: {\textcopyright} 2018 Acta Materialia Inc.",

year = "2019",

month = mar,

doi = "10.1016/j.actamat.2018.11.062",

language = "English",

volume = "166",

pages = "1--17",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier",

}

TY - JOUR

T1 - Multiscale investigations of nanoprecipitate nucleation, growth, and coarsening in annealed low-Cr oxide dispersion strengthened FeCrAl powder

AU - Massey, Caleb P.

AU - Dryepondt, Sebastien N.

AU - Edmondson, Philip D.

AU - Frith, Matthew G.

AU - Littrell, Kenneth C.

AU - Kini, Anoop

AU - Gault, Baptiste

AU - Terrani, Kurt A.

AU - Zinkle, Steven J.

PY - 2019/3

Y1 - 2019/3

N2 - A major challenge in the design of oxide dispersion strengthened (ODS) FeCrAl alloys is the optimization of the fine-scale particle size distribution that provides both beneficial mechanical properties and irradiation resistance. To address this obstacle, the nucleation, growth, and coarsening of the fine-scale (Y,Al,O) nanoprecipitates within an ODS FeCrAl powder was studied using atom probe tomography (APT) and small-angle neutron scattering (SANS). Mechanically alloyed Fe–10Cr-6.1Al-0.3Zr + Y2O3 wt.% (CrAZY) powders were heated in-situ from 20 to 1000 °C to capture the nucleation and growth of the nanoprecipitates using SANS. Furthermore, CrAZY powders were annealed at 1000 °C, 1050 °C, and 1100 °C for ageing times from 15 min to 500 h followed by either APT or magnetic SANS to study the structure, composition, and coarsening kinetics of the nanoprecipitates at high temperature. In-situ SANS results indicate nanoprecipitate nucleation and growth at low temperatures (200–600 °C). APT results revealed compositions corresponding to the cubic Y3Al5O12 garnet (YAG) stoichiometry with a possible transition towards the perovskite YAlO3 (YAP) phase for larger precipitates after sufficient thermal ageing. However, magnetic SANS results suggest a defective structure for the nanoprecipitates indicated by deviations of the calculated A-ratio from stoichiometric (Y,Al,O) phases. Particle coarsening kinetics follow n = 6 power law kinetics with respect to particle size, but the mechanism cannot be explained through the dislocation pipe diffusion mechanism. The potential effect of precipitate coarsening during pre- and post-consolidation heat treatments on the irradiation resistance of ODS FeCrAl alloys is discussed with respect to sink strength maximization.

AB - A major challenge in the design of oxide dispersion strengthened (ODS) FeCrAl alloys is the optimization of the fine-scale particle size distribution that provides both beneficial mechanical properties and irradiation resistance. To address this obstacle, the nucleation, growth, and coarsening of the fine-scale (Y,Al,O) nanoprecipitates within an ODS FeCrAl powder was studied using atom probe tomography (APT) and small-angle neutron scattering (SANS). Mechanically alloyed Fe–10Cr-6.1Al-0.3Zr + Y2O3 wt.% (CrAZY) powders were heated in-situ from 20 to 1000 °C to capture the nucleation and growth of the nanoprecipitates using SANS. Furthermore, CrAZY powders were annealed at 1000 °C, 1050 °C, and 1100 °C for ageing times from 15 min to 500 h followed by either APT or magnetic SANS to study the structure, composition, and coarsening kinetics of the nanoprecipitates at high temperature. In-situ SANS results indicate nanoprecipitate nucleation and growth at low temperatures (200–600 °C). APT results revealed compositions corresponding to the cubic Y3Al5O12 garnet (YAG) stoichiometry with a possible transition towards the perovskite YAlO3 (YAP) phase for larger precipitates after sufficient thermal ageing. However, magnetic SANS results suggest a defective structure for the nanoprecipitates indicated by deviations of the calculated A-ratio from stoichiometric (Y,Al,O) phases. Particle coarsening kinetics follow n = 6 power law kinetics with respect to particle size, but the mechanism cannot be explained through the dislocation pipe diffusion mechanism. The potential effect of precipitate coarsening during pre- and post-consolidation heat treatments on the irradiation resistance of ODS FeCrAl alloys is discussed with respect to sink strength maximization.

KW - Atom probe tomography

KW - Oxide dispersion strengthened (ODS) alloy

KW - Precipitation

KW - Small angle neutron scattering

UR - http://www.scopus.com/inward/record.url?scp=85058625847&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2018.11.062

DO - 10.1016/j.actamat.2018.11.062

M3 - Article

AN - SCOPUS:85058625847

SN - 1359-6454

VL - 166

SP - 1

EP - 17

JO - Acta Materialia

JF - Acta Materialia

ER -

Multiscale investigations of nanoprecipitate nucleation, growth, and coarsening in annealed low-Cr oxide dispersion strengthened FeCrAl powder

Abstract

Bibliographical note

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this