The structural changes of Y2O3 in ferritic ODS alloys during milling

Hilger, I.; Tegel, Marcus; Gorley, Michael; Grant, Patrick S.; Weißgärber, Thomas; Kieback, Bernd

doi:10.1016/j.jnucmat.2014.01.026

Cited by 38 publications

(17 citation statements)

References 24 publications

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“…However, the incorporation of Ti into the NCs might also be conceived to occur during growth of very fine scale Y 2 O 3 , and dissolution of Y and O is not always reflected in the Fe lattice parameter changes that might be expected [13]. If dissolution of Y and O is occurring, it can be further conjectured that a single phase solid solution of Fe(Cr, Ti, Y, O) has a lower free energy at the milling temperature than a two phase mixture of a heavily defective matrix of Fe-14Cr-0.4Ti containing an increasingly fine dispersion of Y 2 O 3 .…”

Section: Microstructure Of 14yt Alloysmentioning

confidence: 99%

“…(i) a supersaturated solid solution containing Y, Ti and O is produced by room temperature MA that decomposes and re-precipitates as NCs during high temperature consolidation [12]; (ii) MA simply fragments Y 2 O 3 to such a fine scale that to most characterisation techniques it appears ''dissolved'' and precipitation is more akin to coarsening to a scale where Y 2 O 3 can again be resolved [13], and (iii) the Y 2 O 3 becomes amorphous during MA and the subsequent precipitation is better described as (re-)crystallization [14].…”

Section: Introductionmentioning

confidence: 99%

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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: Microstructure Of 14yt Alloysmentioning

confidence: 99%

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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“…Whether they form solid solution or amorphous subnanometric fragments is discussed in recent literature [30].…”

Section: Precipitation State In the Consolidated/annealed Materialsmentioning

confidence: 99%

Influence of oxide volume fraction on abnormal growth of nanostructured ferritic steels during non-isothermal treatments: An in situ study

Boulnat¹,

Sallez²,

Dadé³

et al. 2015

Acta Materialia

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“…Different from the technical route of the optimization of composition and microstructure, the oxide dispersion strengthening (ODS) is an effective method to improve the high temperature performances of materials [1]. Thus, the synthesis of ODS superalloys has attracted wide attention.…”

Section: Introductionmentioning

confidence: 99%

Oxide reinforced Ni base composite prepared by spark plasma sintering

et al. 2017

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Abstract. Y2O3 is a favourable reinforcement for the oxide dispersion strengthened superalloy due to its good high temperature stability, excellent strength and large elastic modulus. In this work, Y2O3 is introduced into the K4169 superalloy aiming to improve its high temperature properties. The high quality Y2O3 and K4169 powder mixture can be obtained with the addition of the process control agent of stearic acid after high energy ball milling, and the Y2O3/K4169 composite with uniformly dispersed reinforcement of nanoscale Y2O3 particles are finally synthesized with the ball-milled powders by using spark plasma sintering.

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The structural changes of Y2O3 in ferritic ODS alloys during milling

Cited by 38 publications

References 24 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

Influence of oxide volume fraction on abnormal growth of nanostructured ferritic steels during non-isothermal treatments: An in situ study

Oxide reinforced Ni base composite prepared by spark plasma sintering

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