Structure of oxide nanoparticles in Fe–16Cr MA/ODS ferritic steel

Oxide nanoparticles in Fe–16Cr ODS ferritic steel fabricated by mechanical alloying (MA) method have been examined using high-resolution transmission electron microscopy (HRTEM) techniques. A partial crystallization of oxide nanoparticles was frequently observed in as-fabricated ODS steel. The cryst...

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Bibliographic Details
Published in:Materials letters 2010-08, Vol.64 (16), p.1782-1785
Main Authors: Hsiung, Luke L., Fluss, Michael J., Kimura, Akihiko
Format: Article
Language:English
Subjects:
ANNEALING
Boundaries
CRYSTAL STRUCTURE
CRYSTALLIZATION
Dispersion hardening alloys
Ferritic stainless steels
FERRITIC STEELS
High-resolution electron microscopy
MATERIALS SCIENCE
Mechanical alloying
Nanoparticles
Nanostructure
OXIDES
SHAPE
STEELS
Structural steels
TRANSMISSION ELECTRON MICROSCOPY
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Summary:Oxide nanoparticles in Fe–16Cr ODS ferritic steel fabricated by mechanical alloying (MA) method have been examined using high-resolution transmission electron microscopy (HRTEM) techniques. A partial crystallization of oxide nanoparticles was frequently observed in as-fabricated ODS steel. The crystal structure of crystalline oxide particles is identified to be mainly Y 4Al 2O 9 (YAM) with a monoclinic structure. Large nanoparticles with a diameter larger than 20 nm tend to be incoherent and have a nearly spherical shape, whereas small nanoparticles with a diameter smaller than 10 nm tend to be coherent or semi-coherent and have faceted boundaries. The oxide nanoparticles become fully crystallized after prolonged annealing at 900 °C. These results lead us to propose a three-stage formation mechanism of oxide nanoparticles in MA/ODS steels.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2010.05.039