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

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

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Publication Article, peer reviewed scientific
Title Observations of temperature stability of γ-zirconium hydride by high-resolution neutron powder diffraction
Author(s) Wang, Zhiyang ; Steuwer, Axel ; Liu, Nanxi ; Maimaitiyili, Tuerdi ; Avdeev, Maxim ; Blomqvist, Jakob ; Bjerkén, Christina ; Curfs, Caroline ; A. Kimpton, Justin ; Daniels, John E.
Date 2015
English 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.
DOI http://dx.doi.org/10.1016/j.jallcom.2015.11.187 (link to publisher's fulltext)
Publisher Elsevier
Host/Issue Journal of Alloys and Compounds;661
ISSN 0925-8388
Pages 55-61
Language eng (iso)
Subject(s) Metal hydrides
Phase transitions
Neutron diffraction
Zirconium hydride
Zirconium
Nuclear materials
Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/19775 (link to this page)

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