Oxide particle refinement in Ni-based ODS alloy

Oono, Naoko; Tang, Qingxin; Ukai, Shigeharu

doi:10.1016/j.msea.2015.09.094

Cited by 53 publications

(14 citation statements)

References 12 publications

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“…Faced with the question of identifying a material that has adequate strength both at intermediate and elevated temperatures, John Benjamin of INCO developed this method to uniformly disperse fine yttria (Y 2 O 3 ) particles in a complex nickel-based alloy matrix [10]. Such alloys are now being referred to as oxide-dispersion strengthened (ODS) superalloys [11–14]. The “science” of the MA technique was developed much later in the late 1980s and is continuing to be expanded further.…”

Section: The Process Of Mechanical Alloyingmentioning

confidence: 99%

Mechanical Alloying: A Novel Technique to Synthesize Advanced Materials

Suryanarayana

2019

Research

211

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Mechanical alloying is a solid-state powder processing technique that involves repeated cold welding, fracturing, and rewelding of powder particles in a high-energy ball mill. Originally developed about 50 years ago to produce oxide-dispersion-strengthened Ni- and Fe-based superalloys for aerospace and high temperature applications, it is now recognized as an important technique to synthesize metastable and advanced materials with a high potential for widespread applications. The metastable materials produced include supersaturated solid solutions, intermediate phases, quasicrystalline phases, amorphous alloys, and high-entropy alloys. Additionally, nanocrystalline phases have been produced in virtually every alloy system. Because of the fineness of the powders, their consolidation to full density without any porosity being present is a challenging problem. Several novel methods have been developed to overcome this issue. Powder contamination during milling and subsequent consolidation constitutes another issue; this can be resolved, though expensive. A number of applications have been developed for these novel materials. This review article presents an overview of the process of mechanical alloying, mechanism of grain refinement to nanometer levels, and preparation of materials such as nanocomposites and metallic glasses. The application of mechanical alloying to synthesize some advanced materials such as pure metals and alloys, hydrogen storage materials, and energy materials is described. The article concludes with an outlook on future prospects of this technique.

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Section: The Process Of Mechanical Alloyingmentioning

confidence: 99%

Mechanical Alloying: A Novel Technique to Synthesize Advanced Materials

Suryanarayana

2019

Research

211

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“…Both energies contain the term of the lattice misfit between the particle and the matrix. 69) Although the free energy of precipitation contains also chemical driving force and chemical interfacial free energy, here we discuss the precipitation focusing upon the lattice misfits because we can measure them by TEM. According to Fig.…”

Section: Effects Of Mid-temperature Annealingmentioning

confidence: 99%

Precipitation of Oxide Particles in Oxide Dispersion Strengthened (ODS) Ferritic Steels

Oono

Ukai

2018

Mater. Trans.

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This study tries to reveal the mechanism of forming fine and dense oxide particles in oxide dispersion strengthened (ODS) ferritic steel during heat treatment after mechanical alloying (MA). The MAed powders with and without titanium are set to the heat treatment from 873 K to 1423 K and analyzed by small angle X-ray scattering and X-ray diffraction using synchrotron radiation, transmission electron microscopy, and 3D atom probe. Yttrium and oxygen are segregated along the grain-boundaries induced by MA and form clusters after 873 K annealing. Fine oxide particles are densely formed before primary-recrystallization of the nano-sized grains induced during MA, at 973 K. The formation of cubic-Y 2 O 3 and Y 2 Ti 2 O 7 are observed at 1273 K and above, where the size reduction of the oxide particles by Ti-addition is clearly shown.

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“…where is the coefficient depending on the morphology of the diffusion path, is the diffusivity of the dispersion species which is the slowest moving, 0 is the solubility of the elements which compose the oxide particles. is the interface energy of the oxide particle/matrix, and can be calculated based on the Read-Shockley equation of the well-established dislocation model of grain-boundaries [28]. is the molar volume of the oxide particles.…”

Section: Coarsening Of the Oxide Particles At A High Temperaturementioning

confidence: 99%

Growth of oxide particles in FeCrAl- oxide dispersion strengthened steels at high temperature

Oono

Ukai

Hayashi

et al. 2017

Journal of Nuclear Materials

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The growth of oxide particles in FeCrAl-oxide dispersion strengthened steel (ODSS) considering an accident condition of the light-water reactor at above 1500 K was studied by using a high-temperature annealing. Oxide particles grew from 9nm to more than 50nm as maximum at 1623K for 27h, with decreasing their number density in two orders of magnitude. Most of the oxide particles in 15Cr-7Al were identified as YAM or YAP, while the oxide particles in 15Cr-7Al-0.4Zr were identified trigonal Y 4 Zr 3 O 12. Zr addition to 15Cr-7Al ODSS accelerated the growth of the oxide particles, which is quite contrary to the effect of Zr addition during sintering as suggested in the literature. The kinetics of coarsening was characterized by an equation of Ostwald ripening. The diffusion activation energies obtained in the present materials were quite larger than the conventional diffusion activation energy of Y in alpha-iron. Gibbs free energy of oxides should be considered to discuss the coarsening.

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Oxide particle refinement in Ni-based ODS alloy

Cited by 53 publications

References 12 publications

Mechanical Alloying: A Novel Technique to Synthesize Advanced Materials

Mechanical Alloying: A Novel Technique to Synthesize Advanced Materials

Precipitation of Oxide Particles in Oxide Dispersion Strengthened (ODS) Ferritic Steels

Growth of oxide particles in FeCrAl- oxide dispersion strengthened steels at high temperature

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