New insights into the structure of ODS particles in the ODS-Eurofer alloy

Klimenkov, M.; Lindau, R.; Möslang, A.

doi:10.1016/j.jnucmat.2008.12.174

Cited by 91 publications

(45 citation statements)

References 8 publications

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“…The shell was visible for particles as small as $7 nm thick. The presence of nanoparticles with a similar coreshell structure has been recently reported in ODS alloys by EFTEM [8], Atom Probe Tomography [12] and STEM-EDS-EELS [13]. The Y N 2,3 ,CrM 2,3 and Cr L 2,3 EFTEM signals were successfully separated and extracted from the background using a multiple-window technique, where an inverse power law was used for background extraction.…”

Section: Ods Nanoparticlesmentioning

confidence: 54%

Analytical characterization of secondary phases and void distributions in an ultrafine-grained ODS Fe–14Cr model alloy

Castro

Auger

Lozano-Pérez

et al. 2011

Journal of Nuclear Materials

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Abstract:Two model Fe-14Cr alloys, one containing 0.3 wt.% of Y 2 O 3 particles, were fabricated by mechanical alloying of Fe and Cr elemental powders under a He atmosphere. They were subsequently consolidated and thermomechanically treated to produce ultra-fine grained materials. Cr-carbides and oxides were found in both alloys. The oxide dispersion-strengthened (ODS) alloy also contained a fine dispersion of nanoparticles, some of them having a Y-O rich core and a Cr-rich shell. Nanometric sized voids were found in both materials, often attached to secondary phases, dislocations and grain boundaries. Their sizes were significantly smaller in the ODS alloy.

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Section: Ods Nanoparticlesmentioning

confidence: 54%

Analytical characterization of secondary phases and void distributions in an ultrafine-grained ODS Fe–14Cr model alloy

Castro

Auger

Lozano-Pérez

et al. 2011

Journal of Nuclear Materials

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“…Complex mechanisms involving fragmentation, dissolution of Y 2 O 3 particles, and precipitation of complex-oxide nanoparticles were previously proposed by Okuda and Fujiwara [16], Kimura et al [17] and Sakasegawa et al [18] based on the results generated from x-ray diffraction and conventional TEM studies. However, recent studies conducted by Marquis [19] using a 3-D atom probe method and Klimiankou et al [20] using EDX and EELS methods have revealed the existence of a complex-oxide core structure associated with a soluteenriched shell structure in nanoparticles. The existence of core/shell structures in nanoparticles however challenges the accountability of previously proposed dissolution/precipitation mechanisms.…”

Section: Crystal and Interfacial Structures Of Nanoparticlesmentioning

confidence: 99%

HRTEM study of oxide nanoparticles in K3-ODS ferritic steel developed for radiation tolerance

Hsiung

Fluss

Tumey

et al. 2011

Journal of Nuclear Materials

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Crystal and interfacial structures of oxide nanoparticles and radiation damage in 16Cr-4.5Al-0.3Ti-2W-0.37 Y 2 O 3 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 Y 4 Al 2 O 9 (YAM) oxide compound. Orientation relationships between the oxide and the 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 and multiple crystalline domains formed within a nanoparticle lead us to propose a three-stage mechanism to rationalize the formation of oxide nanoparticles containing core/shell structures in as-fabricated ODS steels. Effects of nanoparticle size and density on cavity formation induced by (Fe 8+ + He + ) dual-beam irradiation are briefly addressed.

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“…The production of nano-structured ODS ferritic steels usually involves powder metallurgical methods including mechanical alloying and subsequent powder compaction using either hot extrusion (HE) [1] or hot isostatic pressing (HIP) [5,6]. HIP usually * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of an ODS RAF steel fabricated by hot extrusion or hot isostatic pressing

Unifantowicz

Oksiuta

Olier

et al. 2011

Fusion Engineering and Design

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a b s t r a c tIngots of an oxide dispersion strengthened reduced activation ferritic steel with the Fe-14Cr-2W-0.3Ti-0.3Y 2 O 3 chemical composition (in wt.%) were synthesized by mechanical alloying of elemental powders with 0.3 wt.% Y 2 O 3 particles in a planetary ball mill, in a hydrogen atmosphere, and compacted by either hot extrusion or hot isostatic pressing. The microstructures of the obtained materials were characterized by means of light microscopy, transmission electron microscopy and chemical analyses. The mechanical properties were evaluated by means of Vickers microhardness measurements and tensile tests. It was found that the microstructure of both materials is composed of ferritic grains having a submicron size and containing nanometric Y-Ti-O oxide particles with a mean size of about 10 nm, uniformly distributed in the matrix. The oxide particles in the hot extruded steel were identified as YTiO 3 phase. In larger (>10 nm) oxide particles Cr was found next to Ti, Y and O. The steel produced by hot extrusion exhibits much higher tensile strength and hardness at low to moderate temperatures, as compared to the steel fabricated by hot isostatic pressing, which was mainly attributed to smaller pores but also to more severe work hardening in the case of the hot extruded steel.

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New insights into the structure of ODS particles in the ODS-Eurofer alloy

Cited by 91 publications

References 8 publications

Analytical characterization of secondary phases and void distributions in an ultrafine-grained ODS Fe–14Cr model alloy

Analytical characterization of secondary phases and void distributions in an ultrafine-grained ODS Fe–14Cr model alloy

HRTEM study of oxide nanoparticles in K3-ODS ferritic steel developed for radiation tolerance

Microstructure and mechanical properties of an ODS RAF steel fabricated by hot extrusion or hot isostatic pressing

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