Processing conditions, microstructure and mechanical properties of hetero-nanostructured ODS FeAl alloys produced by spark plasma sintering

Ji, Gang; Bernard, Frédéric; Launois, Sébastien; Grosdidier, Thierry

doi:10.1016/j.msea.2012.08.142

Cited by 36 publications

(22 citation statements)

References 50 publications

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“…Rajan et al [31] studied the effect of Y 2 O 3 dispersoids on the sintering kinetics of Fe-9Cr-1Mo steel and suggested that the presence of nonconducting Y 2 O 3 particles induced charge build up at the metal-dispersoid interfaces, and thus enhanced localised heat generation and mass transport. Ji et al [32] attributed the development of a hetero-nanostructure containing nano (<100 nm), ultrafine (<500 nm) and micron-sized grains in MA and SPS Fe-39.78Al-0.054Zr-0.01B-0.2Y 2 O 3 to temperature differences across the sample.…”

Section: Introductionmentioning

confidence: 99%

Processing and microstructure characterisation of oxide dispersion strengthened Fe–14Cr–0.4Ti–0.25Y2O3 ferritic steels fabricated by spark plasma sintering

Zhang

Huang

Ning

et al. 2015

Journal of Nuclear Materials

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h i g h l i g h t sNanostructured ODS steels were successfully produced by SPS. Presence of Y 2 Ti 2 O 7 nanoclusters was confirmed by synchrotron XRD and microscopy. The chemistry of nanoclusters tested by ATP indicated they are Y-Ti-O oxides. a b s t r a c tFerritic steels strengthened with Ti-Y-O nanoclusters are leading candidates for fission and fusion reactor components. A Fe-14Cr-0.4Ti + 0.25Y 2 O 3 (14YT) alloy was fabricated by mechanical alloying and subsequently consolidated by spark plasma sintering (SPS). The densification of the 14YT alloys significantly improved with an increase in the sintering temperature. Scanning electron microscopy and electron backscatter diffraction revealed that 14YT SPS-sintered at 1150°C under 50 MPa for 5 min had a high density (99.6%), a random grain orientation and a bimodal grain size distribution (<500 nm and 1-20 lm). Synchrotron X-ray diffraction patterns showed bcc ferrite, Y 2 Ti 2 O 7 , FeO, and chromium carbides, while transmission electron microscopy and atom probe tomography showed uniformly dispersed Y 2 Ti 2 O 7 nanoclusters of <5 nm diameter and number density of 1.04 Â 10 23 m À3 . Due to the very much shorter consolidation times and lower pressures used in SPS compared with the more usual hot isostatic pressing routes, SPS is shown to be a cost-effective technique for oxide dispersion strengthened (ODS) alloy manufacturing with microstructural features consistent with the best-performing ODS alloys.

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Section: Introductionmentioning

confidence: 99%

Processing and microstructure characterisation of oxide dispersion strengthened Fe–14Cr–0.4Ti–0.25Y2O3 ferritic steels fabricated by spark plasma sintering

Zhang

Huang

Ning

et al. 2015

Journal of Nuclear Materials

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“…The nanometer-size grains are considered to be formed through recrystallization throughout the SPS processing. The nanometer-size grains could contribute to alloy's high strength and the micron-size grains could also contribute to alloy's ductility [10]. Therefore, this type of bimodal structure could be desirable for high performance alloy design.…”

Section: Resultsmentioning

confidence: 99%

“…However, the traditional methods are usually time consuming with high costs; sometimes it introduces undesirable anisotropic microstructures [7]. Spark Plasma Sintering (SPS) is an emerging powder consolidation technique, and it has been considered as an alternative method for fabricating ODS alloys after high energy ball milling in recent years [8][9][10]. The advantage of the SPS technique is its high thermo-efficiency that allows a fast sintering at lower temperature [11], as well its potential of relatively low cost for research.…”

Section: Introductionmentioning

confidence: 99%

Fe‐Cr‐Mo based ODS alloys via spark plasma sintering: A combinational characterization study by TEM and APT

Allahar

Burns

et al. 2013

Crystal Research and Technology

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Nanoscale oxides play an important role in oxide dispersion strengthened (ODS) alloys for improved high temperature creep resistance and enhanced radiation damage tolerance. In this study, transmission electron microscopy (TEM) and atom probe tomography (APT) were combined to investigate two novel Fe-16Cr-3Mo (wt.%) based ODS alloys. Spark plasma sintering (SPS) was used to consolidate the ODS alloys from powders that were milled with 0.5 wt.% Y 2 O 3 powder only or with Y 2 O 3 powder and 1 wt.% Ti. TEM characterization revealed that both alloys have a bimodal structure of nanometer-size (ß 100 -500 nm) and micronsize grains with nanostructured oxide precipitates formed along and close to grain boundaries with diameters ranging from five to tens of nanometers. APT provides further quantitative analyses of the oxide precipitates, and also reveals Mo segregation at grain boundaries next to oxide precipitates. The alloys with and without Ti are compared based on their microstructures.

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“…[5] Recently, spark plasma sintering (SPS), which is an advanced pressure-assisted sintering technique utilizing pulsed current (1 000-5 000 A), has been utilized by researchers to consolidate milled ODS powders. [6][7][8][9][10] Typical sintering time can be greatly reduced from several hours in conventional sintering to a few minutes in the SPS, thereby minimizing or eliminating propensity for grain growth. [8,11,12] One of the keys to preparing high performance NFSs lies in minimizing the precipitate size and improving the uniformity in their distribution.…”

Section: Introductionmentioning

confidence: 99%

Sintering Behavior of Lanthana‐Bearing Nanostructured Ferritic Steel Consolidated via Spark Plasma Sintering

et al. 2015

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Elemental powder mixture of Fe-14Cr-1Ti-0.3Mo-0.5La2O3 (wt%) composition is mechanically alloyed for different milling durations (5, 10 and 20 h) and subsequently consolidated via spark plasma sintering under vacuum at 950°C for 7 min. The effects of milling time on the densification behavior and density/microhardness are studies. The sintering activation energy is found to be close to that of grain boundary diffusion. The bimodal grain structure created in the milled and sintered material is found to be a result of milling and not of sintering alone. The oxide particle diameter varies between 2 and 70 nm. Faceted precipitates smaller than 10 nm in diameter are found to be mostly La-Ti-Cr-enriched complex oxides that restrict further recrystallization and related phenomena

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Processing conditions, microstructure and mechanical properties of hetero-nanostructured ODS FeAl alloys produced by spark plasma sintering

Cited by 36 publications

References 50 publications

Processing and microstructure characterisation of oxide dispersion strengthened Fe–14Cr–0.4Ti–0.25Y2O3 ferritic steels fabricated by spark plasma sintering

Processing and microstructure characterisation of oxide dispersion strengthened Fe–14Cr–0.4Ti–0.25Y2O3 ferritic steels fabricated by spark plasma sintering

Fe‐Cr‐Mo based ODS alloys via spark plasma sintering: A combinational characterization study by TEM and APT

Sintering Behavior of Lanthana‐Bearing Nanostructured Ferritic Steel Consolidated via Spark Plasma Sintering

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