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

被引：81

作者：

Hirata, A. ^{[1
]}

Fujita, T. ^{[1
]}

Liu, C. T. ^{[2
]}

Chen, M. W. ^{[1
,3
]}

机构：

[1] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] City Univ Hong Kong, Ctr Adv Struct Mat, MBE Dept, Kowloon, Hong Kong, Peoples R China

[3] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China

来源：

ACTA MATERIALIA | 2012年 / 60卷 / 16期

关键词：

Scanning transmission electron microscopy; Steels; Nanostructure; FERRITIC ALLOYS; MARTENSITIC STEEL; CRYSTAL-STRUCTURE; ODS STEELS; PARTICLES; TEMPERATURE; TEM; IRRADIATION; STABILITY; MA957;

D O I：

10.1016/j.actamat.2012.06.042

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 (similar to 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. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5686 / 5696

页数：11

共 37 条

[1] QUASIMELTING AND PHASES OF SMALL PARTICLES [J].

AJAYAN, PM ;

MARKS, LD .

PHYSICAL REVIEW LETTERS, 1988, 60 (07) :585-587

[2] On the role of alloy composition and processing parameters in nanocluster formation and dispersion strengthening in nanostuctured ferritic alloys [J].

Alinger, M. J. ;

Odette, G. R. ;

Hoelzer, D. T. .

ACTA MATERIALIA, 2009, 57 (02) :392-406

[3] SANS and TEM study of Y2O3 particle distributions in oxide-dispersion strengthened EUROFER martensitic steel for fusion reactors [J].

Coppola, R. ;

Klimiankou, M. ;

Lindau, R. ;

May, R. P. ;

Valli, M. .

PHYSICA B-CONDENSED MATTER, 2004, 350 (1-3) :E545-E548

[4]

Fischer J.J., 1978, U.S. Patent, Patent No. [4,075,010, 4075010]

[5] Vacancy mechanism of high oxygen solubility and nucleation of stable oxygen-enriched clusters in Fe [J].

Fu, C. L. ;

Krcmar, Maja ;

Painter, G. S. ;

Chen, Xing-Qiu .

PHYSICAL REVIEW LETTERS, 2007, 99 (22)

[6] Creep response and deformation processes in nanocluster-strengthened ferritic steels [J].

Hayashi, T. ;

Sarosi, P. M. ;

Schneibel, J. H. ;

Mills, M. J. .

ACTA MATERIALIA, 2008, 56 (07) :1407-1416

[7]

Helmholz L, 1936, Z KRISTALLOGR, V95, P129

[8]

Hirata A, 2011, NAT MATER, V10, P922, DOI [10.1038/NMAT3150, 10.1038/nmat3150]

[9] Influence of particle dispersions on the high-temperature strength of ferritic alloys [J].

Hoelzer, D. T. ;

Bentley, J. ;

Sokolov, M. A. ;

Miller, M. K. ;

Odette, G. R. ;

Alinger, M. J. .

JOURNAL OF NUCLEAR MATERIALS, 2007, 367 (SPEC. ISS.) :166-172

[10] Formation mechanism and the role of nanoparticles in Fe-Cr ODS steels developed for radiation tolerance [J].

Hsiung, Luke L. ;

Fluss, Michael J. ;

Tumey, Scott J. ;

Choi, B. William ;

Serruys, Yves ;

Willaime, Francois ;

Kimura, Akihiko .

PHYSICAL REVIEW B, 2010, 82 (18)

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