Characterization of oxide nanoprecipitates in an oxide dispersion strengthened 14YWT steel using aberration-corrected STEM

Akihiko Hirata, T. Fujita, C. T. Liu, M. W. Chen

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The structure and chemistry of nanoprecipitates in an oxide dispersion strengthened (ODS) 14YWT steel were systematically investigated by means of aberration-corrected scanning transmission electron microscopy. We found that the crystal structure of the nanoprecipitates depends on the particle size, while the compositional difference is insignificant. Large nanoparticles (∼10-30 nm in diameter) have a long period NaCl-based structure including TlI-type stacking, while the small nanoparticles (<5 nm) possess the NaCl-based structure with a high density of lattice defects. The size-related structural difference between small and large nanoparticles reveals the structural origins of the unusual thermal stability of the nanoprecipitates, as well as the extraordinary mechanical properties of ODS steels.

Original languageEnglish
Pages (from-to)5686-5696
Number of pages11
JournalActa Materialia
Volume60
Issue number16
DOIs
Publication statusPublished - 2012 Sep 1
Externally publishedYes

Fingerprint

Steel
Aberrations
Oxides
Nanoparticles
Crystal defects
Thermodynamic stability
Crystal structure
Particle size
Transmission electron microscopy
Mechanical properties
Scanning electron microscopy

Keywords

  • Nanostructure
  • Scanning transmission electron microscopy
  • Steels

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

Cite this

Characterization of oxide nanoprecipitates in an oxide dispersion strengthened 14YWT steel using aberration-corrected STEM. / Hirata, Akihiko; Fujita, T.; Liu, C. T.; Chen, M. W.

In: Acta Materialia, Vol. 60, No. 16, 01.09.2012, p. 5686-5696.

Research output: Contribution to journalArticle

@article{2531d77d305740a1b9c107d8ff6481df,
title = "Characterization of oxide nanoprecipitates in an oxide dispersion strengthened 14YWT steel using aberration-corrected STEM",
abstract = "The structure and chemistry of nanoprecipitates in an oxide dispersion strengthened (ODS) 14YWT steel were systematically investigated by means of aberration-corrected scanning transmission electron microscopy. We found that the crystal structure of the nanoprecipitates depends on the particle size, while the compositional difference is insignificant. Large nanoparticles (∼10-30 nm in diameter) have a long period NaCl-based structure including TlI-type stacking, while the small nanoparticles (<5 nm) possess the NaCl-based structure with a high density of lattice defects. The size-related structural difference between small and large nanoparticles reveals the structural origins of the unusual thermal stability of the nanoprecipitates, as well as the extraordinary mechanical properties of ODS steels.",
keywords = "Nanostructure, Scanning transmission electron microscopy, Steels",
author = "Akihiko Hirata and T. Fujita and Liu, {C. T.} and Chen, {M. W.}",
year = "2012",
month = "9",
day = "1",
doi = "10.1016/j.actamat.2012.06.042",
language = "English",
volume = "60",
pages = "5686--5696",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier Limited",
number = "16",

}

TY - JOUR

T1 - Characterization of oxide nanoprecipitates in an oxide dispersion strengthened 14YWT steel using aberration-corrected STEM

AU - Hirata, Akihiko

AU - Fujita, T.

AU - Liu, C. T.

AU - Chen, M. W.

PY - 2012/9/1

Y1 - 2012/9/1

N2 - The structure and chemistry of nanoprecipitates in an oxide dispersion strengthened (ODS) 14YWT steel were systematically investigated by means of aberration-corrected scanning transmission electron microscopy. We found that the crystal structure of the nanoprecipitates depends on the particle size, while the compositional difference is insignificant. Large nanoparticles (∼10-30 nm in diameter) have a long period NaCl-based structure including TlI-type stacking, while the small nanoparticles (<5 nm) possess the NaCl-based structure with a high density of lattice defects. The size-related structural difference between small and large nanoparticles reveals the structural origins of the unusual thermal stability of the nanoprecipitates, as well as the extraordinary mechanical properties of ODS steels.

AB - The structure and chemistry of nanoprecipitates in an oxide dispersion strengthened (ODS) 14YWT steel were systematically investigated by means of aberration-corrected scanning transmission electron microscopy. We found that the crystal structure of the nanoprecipitates depends on the particle size, while the compositional difference is insignificant. Large nanoparticles (∼10-30 nm in diameter) have a long period NaCl-based structure including TlI-type stacking, while the small nanoparticles (<5 nm) possess the NaCl-based structure with a high density of lattice defects. The size-related structural difference between small and large nanoparticles reveals the structural origins of the unusual thermal stability of the nanoprecipitates, as well as the extraordinary mechanical properties of ODS steels.

KW - Nanostructure

KW - Scanning transmission electron microscopy

KW - Steels

UR - http://www.scopus.com/inward/record.url?scp=84866115126&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84866115126&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2012.06.042

DO - 10.1016/j.actamat.2012.06.042

M3 - Article

AN - SCOPUS:84866115126

VL - 60

SP - 5686

EP - 5696

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

IS - 16

ER -