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Observations of temperature stability of γ-zirconium hydride by high-resolution neutron powder diffraction

Wang, Zhiyang; Steuwer, Axel; Liu, Nanxi; Maimaitiyili, Tuerdi LU ; Avdeev, Maxim; Blomqvist, Jakob; Bjerkén, Christina LU ; Curfs, Caroline; Kimpton, Justin A. and Daniels, John E. (2015) In Journal of Alloys and Compounds 661. p.55-61
Abstract
The phase evolution in a zirconium–50 deuterium (Zr–50D, at.%) alloy system during thermal cycling has been investigated using in situ high-resolution neutron powder diffraction. The results showed that the peritectoid reaction α-Zr + δ-ZrD → γ-ZrD previously suggested to occur at high temperatures does not take place in the system. Slow cooling, from high temperatures (≥520 K) to room temperature at a rate of 5 K min–1, promoted the γ-hydride formation rather than fast cooling as reported earlier. In contrast to the observation that the δ-hydride present in the system remained at temperatures up to 740 K, the produced γ phase transformed to δ-hydride in the temperature range of 370 K to 559 K, with the transformation completing at... (More)
The phase evolution in a zirconium–50 deuterium (Zr–50D, at.%) alloy system during thermal cycling has been investigated using in situ high-resolution neutron powder diffraction. The results showed that the peritectoid reaction α-Zr + δ-ZrD → γ-ZrD previously suggested to occur at high temperatures does not take place in the system. Slow cooling, from high temperatures (≥520 K) to room temperature at a rate of 5 K min–1, promoted the γ-hydride formation rather than fast cooling as reported earlier. In contrast to the observation that the δ-hydride present in the system remained at temperatures up to 740 K, the produced γ phase transformed to δ-hydride in the temperature range of 370 K to 559 K, with the transformation completing at approximately 559 K. It is confirmed that the formation of the γ-hydride was reproducible with slow cooling, and a diffusion-controlled sluggish δ-to γ-hydride transformation is suggested to be responsible for the favorable development of γ-hydride during slow cooling. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Metal hydrides, Phase transitions, Neutron diffraction, Zirconium hydride, Zirconium, Nuclear materials
in
Journal of Alloys and Compounds
volume
661
pages
55 - 61
publisher
Elsevier
external identifiers
  • scopus:84949783111
ISSN
0925-8388
DOI
10.1016/j.jallcom.2015.11.187
language
English
LU publication?
no
id
ede59cff-3f3c-4239-b2e2-38b4cd4e14d6 (old id 8244572)
date added to LUP
2016-02-08 16:13:20
date last changed
2017-09-10 04:09:18
@article{ede59cff-3f3c-4239-b2e2-38b4cd4e14d6,
  abstract     = {The phase evolution in a zirconium–50 deuterium (Zr–50D, at.%) alloy system during thermal cycling has been investigated using in situ high-resolution neutron powder diffraction. The results showed that the peritectoid reaction α-Zr + δ-ZrD → γ-ZrD previously suggested to occur at high temperatures does not take place in the system. Slow cooling, from high temperatures (≥520 K) to room temperature at a rate of 5 K min–1, promoted the γ-hydride formation rather than fast cooling as reported earlier. In contrast to the observation that the δ-hydride present in the system remained at temperatures up to 740 K, the produced γ phase transformed to δ-hydride in the temperature range of 370 K to 559 K, with the transformation completing at approximately 559 K. It is confirmed that the formation of the γ-hydride was reproducible with slow cooling, and a diffusion-controlled sluggish δ-to γ-hydride transformation is suggested to be responsible for the favorable development of γ-hydride during slow cooling.},
  author       = {Wang, Zhiyang and Steuwer, Axel and Liu, Nanxi and Maimaitiyili, Tuerdi and Avdeev, Maxim and Blomqvist, Jakob and Bjerkén, Christina and Curfs, Caroline and Kimpton, Justin A. and Daniels, John E.},
  issn         = {0925-8388},
  keyword      = {Metal hydrides,Phase transitions,Neutron diffraction,Zirconium hydride,Zirconium,Nuclear materials},
  language     = {eng},
  pages        = {55--61},
  publisher    = {Elsevier},
  series       = {Journal of Alloys and Compounds},
  title        = {Observations of temperature stability of γ-zirconium hydride by high-resolution neutron powder diffraction},
  url          = {http://dx.doi.org/10.1016/j.jallcom.2015.11.187},
  volume       = {661},
  year         = {2015},
}