Morphology and structure evolution of Y2O3 nanoparticles in ODS steel powders during mechanical alloying and annealing

Zhao, Qian; Yu, Liming; Liu, Yongchang; Li, Huijun

doi:10.1016/j.apt.2015.08.017

Cited by 33 publications

(9 citation statements)

References 18 publications

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“…Among many of them, one may list: excellent mechanical properties, resistance to irradiation (especially at high temperature environment), structural integrity, and high swelling resistance (Chen, Richter, & Kögler, ; Chen, Richter, Kögler, & Wu, ; Heintze et al, ; Odette, Alinger, & Wirth, ; Zhang et al, ). Oxide dispersion strengthened steels (ODS) are promising candidate materials for the first wall and blanked structure material of future fusion reactors operating at 750°C or higher due to their high creep strength, good oxidation and corrosion resistance, and perfect tolerance of high fluxes of high energy neutrons (Dousti, Mojaaver, Shahverdi, & Mamoory, ; Zhao, Yu, Liu, & Li, ). The above‐mentioned properties of ODS steels comes mainly from the ceramic nano‐precipitates which are an integral part of the structure of the material (Heintze et al, ; Kurpaska, Jagielski, & Nowakowska‐Langier, ; Swenson, Dolph, & Wharry, ).…”

Section: Introductionmentioning

confidence: 99%

“…These steels are produced by powder metallurgy, which includes preparation of powders by alloying of the elements constituting steel matrix and mixing them with Y 2 O 3 nanopowder, subsequent consolidation of the powders (Oksiuta, Lewandowska, Kurzydłowski, & Baluc, ; Unifantowicz, Płociński, Williams, Schaublin, & Baluc, ). Numerous studies (Dousti et al, ; Oksiuta et al, ; Unifantowicz et al, ; Zhao et al, ) indicate that hot extrusion (HE), hot pressing (HP), or hot isostatic pressing are the most desirable method for obtained ODS steels. However, these methods do not allow the porosity of the structure to be completely eliminated, so the material is subjected to annealing to improve its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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High resolution SEM characterization of nano‐precipitates in ODS steels

Jóźwik

Strojny-Nędza

Chmielewski

et al. 2018

Microscopy Res & Technique

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The performance of the present-day scanning electron microscopy (SEM) extends far beyond delivering electronic images of the surface topography. Oxide dispersion strengthened (ODS) steel is on of the most promising materials for the future nuclear fusion reactor because of its good radiation resistance, and higher operation temperature up to 750°C. The microstructure of ODS should not exceed tens of nm, therefore there is a strong need in a fast and reliable technique for their characterization. In this work, the results of low-kV SEM characterization of nanoprecipitates formed in the ODS matrix are presented. Application of highly sensitive photo-diode BSE detector in SEM imaging allowed for the registration of single nm-sized precipitates in the vicinity of the ODS alloys. The composition of the precipitates has been confirmed by TEM-EDS.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High resolution SEM characterization of nano‐precipitates in ODS steels

Jóźwik

Strojny-Nędza

Chmielewski

et al. 2018

Microscopy Res & Technique

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“…Nevertheless, IR bands are not detected in the region of 0–400 cm −1 due to experimental limitations. In this region, three prominent F u vibrations located at around 326 cm −1 , 329 cm −1 , and 367 cm −1 are assigned to the in‐planar Y─O─Y stretching modes which corresponds to the oxygen atoms vibrating in one direction and the yttrium atoms in the other . Other weaker F u vibration modes observed at 460 and 569 cm −1 are assigned to the stretching of an Y─O bond .…”

Section: Resultsmentioning

confidence: 95%

Efficient ab initio quantum mechanical simulations of structural stability and vibrational properties of bulk, monolayer and (n,0) nanotubes: Yttrium sesquioxide Y₂O₃

Larbi

El‐Kelany

Doll

et al. 2019

J Raman Spectroscopy

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In this contribution, we report reliable ab initio quantum mechanical simulations of a variety of physical properties concerning yttrium sesquioxide (Y2O3) in different arrangements from the bulk, the monolayer (h‐Y2O3), to the (n,0) single‐walled nanotubes in the range from n = 6 to 32, for geometry optimization and vibrational properties. Structural parameters, phonon wavenumbers, infrared (IR) and Raman intensities, and elastic constants are computed via density functional theory (DFT/B3LYP) where the trend towards the (h‐Y2O3) monolayer for large nanotube radius is discussed. We firstly report combined experimental and computational studies on the structural and vibrational properties of the bulk Y2O3. Then, IR and Raman spectra of all arrangements are simulated via the coupled perturbed Hartree–Fock and Kohn–Sham (CPHF/KS) computational schemes. For the (n,0) Y2O3 nanotube family, two sets of IR active phonon modes in the (200–400 cm−1) and (600–900 cm−1) ranges are determined. Both of them tend smoothly with different slope, towards the optical vibrational modes of the h‐Y2O3 single layer. Three sets of active phonon bands are obtained in their Raman spectrum. The first one, in the 0–100 cm−1 range contains two phonon modes, their vibration wavenumbers tend to zero at very large tube radius and are found to be connected to the elastic constants C11 and C66 of the h‐Y2O3 monolayer as the 1D → 2D transition is approached. The second one, in 200–400 cm−1 range tends to the optical mode E′ (ν = 308 cm−1) of the monolayer. The third set, in the 600–900 cm−1 range contains two active modes, their intensities tend to zero in the limit of large nanotube without change in their vibration wavenumbers.

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“…Size reduction during mechanical alloying is clearly observed for 10 hours of milling. Cold welding was also exhibited during longer milling time, hence mechanically alloying have agglomerated fine particles into micron size [33].…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Hot Pressed 16.5CR Ferritic ODS Steel Developed Through Mechanical Alloying

Dharmalingam¹,

Tjprc²

2018

IJMPERD

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Two different ferritic oxide-dispersion-strengthened (ODS) steels compositions Fe-16.5Cr-0.89Mn-0.3Y 2 O 3-2ZrO 2 (Sample1) and Fe-16.5Cr-0.89Mn-0.3Y 2 O 3-2ZrO 2-2Al (Sample2) were prepared through Mechanical Alloying (MA) and X-Ray Diffraction (XRD) pattern were taken at different time intervals for confirming the Nano-crystallite size. Milled powders were consolidated at 1170 O C at three different pressure levels of 30, 40 and 60 MPa respectively. Densification studies, microstructural examination ,and mechanical properties evaluation were analyzed and reported in the current study. MA of the hot pressed powder at 60 MPa obtained the highest density, hardness ,and tensile strength compared with another pressure compact irrespective of its composition. Aluminum addition in the ferritic ODS steel lowers the density, hardness ,and elongation of the ferritic ODS steel samples.

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Morphology and structure evolution of Y2O3 nanoparticles in ODS steel powders during mechanical alloying and annealing

Cited by 33 publications

References 18 publications

High resolution SEM characterization of nano‐precipitates in ODS steels

High resolution SEM characterization of nano‐precipitates in ODS steels

Efficient ab initio quantum mechanical simulations of structural stability and vibrational properties of bulk, monolayer and (n,0) nanotubes: Yttrium sesquioxide Y₂O₃

Microstructure and Mechanical Properties of Hot Pressed 16.5CR Ferritic ODS Steel Developed Through Mechanical Alloying

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Morphology and structure evolution of Y2O3 nanoparticles in ODS steel powders during mechanical alloying and annealing

Cited by 33 publications

References 18 publications

High resolution SEM characterization of nano‐precipitates in ODS steels

High resolution SEM characterization of nano‐precipitates in ODS steels

Efficient ab initio quantum mechanical simulations of structural stability and vibrational properties of bulk, monolayer and (n,0) nanotubes: Yttrium sesquioxide Y2O3

Microstructure and Mechanical Properties of Hot Pressed 16.5CR Ferritic ODS Steel Developed Through Mechanical Alloying

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Product

Resources

About

Efficient ab initio quantum mechanical simulations of structural stability and vibrational properties of bulk, monolayer and (n,0) nanotubes: Yttrium sesquioxide Y₂O₃