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Title: Observations of temperature stability of γ-zirconium hydride by high-resolution neutron powder diffraction
Authors: Wang, Z
Steuwer, A
Liu, N
Maimaitiyili, T
Avdeev, M
Blomqvist, J
Bjerkén, C
Curfs, C
Kimpton, JA
Daniels, JE
Keywords: Neutron diffraction
Phase transformations
Issue Date: 15-Mar-2016
Publisher: Elsevier
Citation: Wang, Z., Steuwer, A., Liu, N., Maimaitiyili, T., Avdeev, M., Blomqvist, J., Bjerkén, C., Curfs, C., Kimpton, J. A., & Daniels, J. E. (2016). Observations of temperature stability of γ-zirconium hydride by high-resolution neutron powder diffraction. Journal of Alloys and Compounds, 661, 55-61, doi:10.1016/j.jallcom.2015.11.187
Series/Report no.: 0925-8388;
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–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. © 2015 Elsevier B.V.
ISSN: 0925-8388
Appears in Collections:Journal Articles

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