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

journal contribution
posted on 2016-03-15, 00:00 authored by Zhiyang Wang, A Steuwer, N Liu, T Maimaitiyili, M Avdeev, J Blomqvist, C Bjerkén, C Curfs, J A Kimpton, J E Daniels
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.

History

Journal

Journal of alloys and compounds

Volume

661

Pagination

55 - 61

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0925-8388

eISSN

1873-4669

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2015, Elsevier