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Microstructural comparison of effects of hafnium and titanium additions in spark-plasma-sintered Fe-based oxide-dispersion strengthened alloys
journal contribution
posted on 2017-03-13, 14:34 authored by Yina Huang, Hongtao ZhangHongtao Zhang, Maria A. Auger, Zuliang Hong, Huanpo Ning, Michael J. Gorley, Patrick S. Grant, Michael J. Reece, Haixue Yan, Steve G. RobertsTwo 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.
Funding
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.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Published in
Journal of Nuclear MaterialsCitation
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.Publisher
© The Authors. Published by Elsevier LtdVersion
- NA (Not Applicable or Unknown)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/Acceptance date
2017-02-20Publication date
2017Notes
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/ISSN
0022-3115Publisher version
Language
- en