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Title: Formation mechanism and the role of nanoparticles in Fe-Cr ODS steels developed for radiation tolerance

Abstract

Structures of nanoparticles in Fe-16Cr-4.5Al-0.3Ti-2W-0.37Y{sub 2}O{sub 3} (K3) and Fe-20Cr-4.5Al-0.34Ti-0.5Y{sub 2}O{sub 3} (MA956) oxide dispersion strengthened (ODS) ferritic steels produced by mechanical alloying (MA) and followed by hot extrusion have been studied using high-resolution transmission electron microscopy (HRTEM) techniques to understand the formation mechanism of nanoparticles in MA/ODS steels. The observations of Y-Al-O complex-oxide nanoparticles in both ODS steels imply that decomposition of Y{sub 2}O{sub 3} in association with internal oxidation of Al occurred during mechanical alloying. While the majority of oxide nanoparticles formed in both steels is Y{sub 4}Al{sub 2}O{sub 9}, a few oxide particles of YAlO{sub 3} are also observed occasionally. These results reveal that Ti (0.3 wt %) plays an insignificant role in forming oxide nanoparticles in the presence of Al (4.5 wt %). HRTEM observations of crystalline nanoparticles larger than {approx}2 nm and amorphous or disordered cluster domains smaller than {approx}2 nm provide an insight into the formation mechanism of oxide nanoparticle in MA/ODS steels, which we believe from our observations involves solid-state amorphization and recrystallization. The role of nanoparticles in suppressing radiation-induced swelling is revealed through TEM examinations of cavity distributions in ion-irradiated Fe-14Cr and K3-ODS ferritic steels. HRTEM observations of helium-filled cavities (helium bubbles)more » preferably trapped at nanoscale oxide particles and clusters in ion-irradiated K3-ODS are presented.« less

Authors:
; ; ;  [1]; ;  [2];  [3]
  1. Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  2. Service de Recherches de Metallurgie Physique, CEA, Gif-sur-Yvette 91191 (France)
  3. Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan)
Publication Date:
OSTI Identifier:
21502873
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 82; Journal Issue: 18; Other Information: DOI: 10.1103/PhysRevB.82.184103; (c) 2010 The American Physical Society; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ALUMINIUM COMPLEXES; AMORPHOUS STATE; CHROMIUM COMPLEXES; DECOMPOSITION; DISPERSIONS; DISTRIBUTION; FERRITIC STEELS; IRON COMPLEXES; NANOSTRUCTURES; RADIATION HARDENING; RECRYSTALLIZATION; RESOLUTION; SOLIDS; TITANIUM COMPLEXES; TOLERANCE; TRANSMISSION ELECTRON MICROSCOPY; TRAPPING; TUNGSTEN COMPLEXES; YTTRIUM OXIDES; ALLOYS; CARBON ADDITIONS; CHALCOGENIDES; CHEMICAL REACTIONS; COMPLEXES; ELECTRON MICROSCOPY; HARDENING; IRON ALLOYS; IRON BASE ALLOYS; MICROSCOPY; OXIDES; OXYGEN COMPOUNDS; PHYSICAL RADIATION EFFECTS; RADIATION EFFECTS; STEELS; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPLEXES; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS

Citation Formats

Hsiung, Luke L, Fluss, Michael J, Tumey, Scott J, Choi, B William, Serruys, Yves, Willaime, Francois, and Kimura, Akihiko. Formation mechanism and the role of nanoparticles in Fe-Cr ODS steels developed for radiation tolerance. United States: N. p., 2010. Web. doi:10.1103/PHYSREVB.82.184103.
Hsiung, Luke L, Fluss, Michael J, Tumey, Scott J, Choi, B William, Serruys, Yves, Willaime, Francois, & Kimura, Akihiko. Formation mechanism and the role of nanoparticles in Fe-Cr ODS steels developed for radiation tolerance. United States. https://doi.org/10.1103/PHYSREVB.82.184103
Hsiung, Luke L, Fluss, Michael J, Tumey, Scott J, Choi, B William, Serruys, Yves, Willaime, Francois, and Kimura, Akihiko. 2010. "Formation mechanism and the role of nanoparticles in Fe-Cr ODS steels developed for radiation tolerance". United States. https://doi.org/10.1103/PHYSREVB.82.184103.
@article{osti_21502873,
title = {Formation mechanism and the role of nanoparticles in Fe-Cr ODS steels developed for radiation tolerance},
author = {Hsiung, Luke L and Fluss, Michael J and Tumey, Scott J and Choi, B William and Serruys, Yves and Willaime, Francois and Kimura, Akihiko},
abstractNote = {Structures of nanoparticles in Fe-16Cr-4.5Al-0.3Ti-2W-0.37Y{sub 2}O{sub 3} (K3) and Fe-20Cr-4.5Al-0.34Ti-0.5Y{sub 2}O{sub 3} (MA956) oxide dispersion strengthened (ODS) ferritic steels produced by mechanical alloying (MA) and followed by hot extrusion have been studied using high-resolution transmission electron microscopy (HRTEM) techniques to understand the formation mechanism of nanoparticles in MA/ODS steels. The observations of Y-Al-O complex-oxide nanoparticles in both ODS steels imply that decomposition of Y{sub 2}O{sub 3} in association with internal oxidation of Al occurred during mechanical alloying. While the majority of oxide nanoparticles formed in both steels is Y{sub 4}Al{sub 2}O{sub 9}, a few oxide particles of YAlO{sub 3} are also observed occasionally. These results reveal that Ti (0.3 wt %) plays an insignificant role in forming oxide nanoparticles in the presence of Al (4.5 wt %). HRTEM observations of crystalline nanoparticles larger than {approx}2 nm and amorphous or disordered cluster domains smaller than {approx}2 nm provide an insight into the formation mechanism of oxide nanoparticle in MA/ODS steels, which we believe from our observations involves solid-state amorphization and recrystallization. The role of nanoparticles in suppressing radiation-induced swelling is revealed through TEM examinations of cavity distributions in ion-irradiated Fe-14Cr and K3-ODS ferritic steels. HRTEM observations of helium-filled cavities (helium bubbles) preferably trapped at nanoscale oxide particles and clusters in ion-irradiated K3-ODS are presented.},
doi = {10.1103/PHYSREVB.82.184103},
url = {https://www.osti.gov/biblio/21502873}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 18,
volume = 82,
place = {United States},
year = {2010},
month = {11}
}