Microstructural evolution and chemical redistribution in Fe–Cr–W–Ti–Y2O3 nanostructured powders prepared by ball milling

Dousti, Behnoush; Mojaver, Reza; Shahverdi, Hamid Reza; Sarraf-Mamoory, Rasoul

doi:10.1016/j.jallcom.2013.05.201

Cited by 20 publications

(12 citation statements)

References 41 publications

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“…The peaks of the Y 2 O 3 and Fe-Cr matrix are obvious in the XRD spectrum of the as-mixed powders, while the peaks of elements such as W, V and Ta are barely observable due to their relatively low concentrations. After 30 min milling, the peaks of Y 2 O 3 decrease dramatically and then thoroughly disappear for prolonged milling time, indicating that the Y 2 O 3 particles have dissolved into the Fe-Cr matrix during the MA process [2]. The full width at half maximum of Fe-Cr peaks shown in the patterns implies a remarkable grain refinement, crystal imperfections and severe plastic deformation caused by ball milling [16][17][18].…”

Section: Resultsmentioning

confidence: 94%

“…Oxide dispersion strengthened (ODS) steels are promising candidate materials for the first wall and blanket structure material of future fusion reactors to 700°C or higher due to their high creep strength, good oxidation and corrosion resistance, and perfect tolerance of high fluxes of high energy neutrons [1][2][3]. As the major strengthening phase, Y 2 O 3 nanoparticles are regular appended to the Fe-Cr matrix [4].…”

Section: Introductionmentioning

confidence: 99%

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

Zhao

Liu

et al. 2015

Advanced Powder Technology

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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

Zhao

Liu

et al. 2015

Advanced Powder Technology

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“…Empirical observations have also indicated that long milling times of the precursor material [19,40] are needed to achieve a uniform as-milled microstructure. This was also supported by producing 14YWT with additions of Fe 2 O 3 and YH 2 powder instead of Y 2 O 3 powder [41].…”

Section: Discussionmentioning

confidence: 99%

The role of processing route on the microstructure of 14YWT nanostructured ferritic alloy

Mazumder

Parish

Bei

et al. 2015

Journal of Nuclear Materials

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a b s t r a c tNanostructured ferritic alloys have outstanding high temperature creep properties and enhanced tolerance to radiation damage over conventional ferritic alloys. To achieve these properties, NFAs are fabricated by mechanical alloying of metallic and yttria powders. Atom probe tomography has demonstrated that milling times of at least 40 h are required to produce a uniform distribution of solutes in the flakes. After milling and hot extrusion, the microstructure consists of a-Fe, high number densities of TieY eO-vacancy-enriched nanoclusters, and coarse Y 2 Ti 2 O 7 and Ti(O,C,N) precipitates on the grain boundaries. In contrast, the as-cast condition consists of a-Fe with 50e100 mm irregularly-shaped Y 2 Ti 2 O 7 pyrochlore precipitates with smaller embedded precipitates with the Y 3 Al 5 O 12 (yttriumealuminum garnet) crystal structure indicating that this traditional processing route is not a viable approach to achieve the desired microstructure. The nano-hardnesses were also substantially different, i.e., 4 and 8 GPa for the as-cast and as-extruded conditions, respectively. These variances can be explained by the microstructural differences and the effects of the high vacancy content introduced by mechanical alloying, and the strong binding energy of vacancies with O, Ti, and Y atoms that retard diffusion.Published by Elsevier B.V.

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“…The resistance to corrosion and oxidation of ODS steels can be enhanced significantly by increasing the Cr content from 9 to 18 pct without causing much concern from r phase embrittlement. [17] The microstructural evolution in ODS steels is very complex and is dependent on several variables employed during high-energy ball milling, [18,19] upset forging, [20,21] and hot extrusion. [22,23] The present study is aimed at developing a comprehensive understanding of evolving microstructure during various stages associated with manufacturing of ODS-18Cr steel.…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on Microstructure and Hardness of Oxide Dispersion Strengthened 18Cr Ferritic Steel

Nagini

Vijay

Rajulapati

et al. 2016

Metall Mater Trans A

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Pre-alloyed ferritic 18Cr steel (Fe-18Cr-2.3W-0.3Ti) powder was milled with and without nano-yttria in high-energy ball mill for varying times until steady-state is reached. The milled powders were consolidated by upset forging followed by hot extrusion. Microstructural changes were examined at all stages of processing (milling, upset forging, and extrusion). In milled powders, crystallite size decreases and hardness increases with increasing milling time reaching a steady-state beyond 5 hours. The size of Y 2 O 3 particles in powders decreases with milling time and under steady-state milling conditions; the particles either dissolve in matrix or form atomic clusters. Upset forged sample consists of unrecrystallized grain structure with few pockets of fine recrystallized grains and dispersoids of 2 to 4 nm. In extruded and annealed rods, the particles are of cuboidal Y 2 Ti 2 O 7 at all sizes and their size decreased from 15 nm to 5 nm along with significant increase in number density. The oxide particles in ODS6 are of cuboidal Y 2 Ti 2 O 7 with diamond cubic crystal structure (Fd 3m) having a lattice parameter of 10.1 Å and are semicoherent with the matrix. The hardness values of extruded and annealed samples predicted by linear summation model compare well with measured values.

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Microstructural evolution and chemical redistribution in Fe–Cr–W–Ti–Y2O3 nanostructured powders prepared by ball milling

Cited by 20 publications

References 41 publications

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

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

The role of processing route on the microstructure of 14YWT nanostructured ferritic alloy

Effect of Process Parameters on Microstructure and Hardness of Oxide Dispersion Strengthened 18Cr Ferritic Steel

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