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Title: Microstructural comparison of effects of hafnium and titanium additions in spark-plasma-sintered Fe-based oxide-dispersion strengthened alloys
Authors: Huang, Yina
Zhang, Hongtao
Auger, Maria A.
Hong, Zuliang
Ning, Huanpo
Gorley, Michael J.
Grant, Patrick S.
Reece, Michael J.
Yan, Haixue
Roberts, Steve G.
Issue Date: 2017
Publisher: © The Authors. Published by Elsevier Ltd
Citation: Huang, Y. ...et al., 2017. Microstructural comparison of effects of hafnium and titanium additions in spark-plasma-sintered Fe-based oxide-dispersion strengthened alloys. Journal of Nuclear Materials, 487, pp. 433–442.
Abstract: Two oxide dispersion strengthened alloys: 14Cr-0.25Y2O3-0.22Hf (wt.%) and Fe-14Cr-0.25Y2O3-0.4Ti (wt.%) were fabricated by mechanical alloying and subsequently consolidated by spark plasma sintering (SPS). Electron backscatter diffraction showed grain sizes in the range 0.5e15 mm in both alloys. Transmission electron microscopy and scanning transmission electron microscopy showed a homogeneous distribution of nano-oxides precipitated during SPS. Using high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy and atom probe tomography, several different oxide phases were found in both alloys, but the majority of dispersoids were Y-Hf-O type in Fe-14Cr-0.25Y2O3-0.22Hf and Y-Ti-O type in Fe-14Cr-0.25Y2O3-0.4Ti. There were a variety of orientation relationships between the different dispersoids and the ferritic matrix. Both alloys had dispersoid densities of ~1023/m3, with average diameters of 4.3 nm and 3.5 nm in the 0.22Hf and 0.4Ti containing alloys, respectively. Per atom added, Hf (0.07 at.%) is suggested to be more potent than Ti (0.46 at.%) in refining the nano-oxides.
Description: This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: This work was supported by the UK Engineering and Physical Science Research Council (EPSRC) for financial support through grant EP/H018921/1 “Materials Fission and Fusion Power”and RCUK Energy Programme for financial support through grant EP/1501045.
Version: Published version
DOI: 10.1016/j.jnucmat.2017.02.030
URI: https://dspace.lboro.ac.uk/2134/24399
Publisher Link: http://dx.doi.org/10.1016/j.jnucmat.2017.02.030
ISSN: 0022-3115
Appears in Collections:Published Articles (Materials)

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