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HRTEM Study of Oxide Nanoparticles in 16Cr-4Al-2W-0.3Ti-0.3Y2O3 ODS Steel

Published online by Cambridge University Press:  31 January 2011

Luke Hsiung ,
Mike Fluss ,
Mark Wall  and
Akihiko Kimura
Luke Hsiung
Affiliation:
[email protected], Lawrence Livermore National Laboratory, Physical and Life Sciences, Livermore, California, United States
Mike Fluss
Affiliation:
[email protected], United States
Mark Wall
Affiliation:
[email protected], Lawrence Livermore National Laboratory, Physical and Life Sciences, Livermore, California, United States
Akihiko Kimura
Affiliation:
[email protected], Kyoto University, Kyoto, Japan
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Abstract

Crystal and interfacial structures of oxide nanoparticles in 16Cr-4Al-2W-0.3Ti-0.3Y2O3 ODS ferritic steel have been examined using high-resolution transmission electron microscopy (HRTEM) techniques. Oxide nanoparticles with a complex-oxide core and an amorphous shell were frequently observed. The crystal structure of complex-oxide core is identified to be mainly monoclinic Y4Al2O9 (YAM) oxide compound. Orientation relationships between the oxide and matrix are found to be dependent on the particle size. Large particles (> 20 nm) tend to be incoherent and have a spherical shape, whereas small particles (< 10 nm) tend to be coherent or semi-coherent and have a faceted interface. The observations of partially amorphous nanoparticles lead us to propose three-stage mechanisms in order to rationalize the formation of oxide nanoparticles containing core/shell structures in as-fabricated ODS steels.

Keywords

transmission electron microscopy (TEM)nanostructuremechanical alloying
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1215: Symposium V – Materials Research Needs to Advance Nuclear Energy , 2009 , 1215-V02-04
Copyright
Copyright © Materials Research Society 2010

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