The preparation of Zr-deuteride and phase stability studies of the Zr-D system

JOURNAL OF NUCLEAR MATERIALS

卷:485

Article

Maimaitiyili, T.¹  Steuwer, A.²  Bjerken, C.¹  Blomqvist, J.¹  Hoelzel, M.³  Ion, J. C.¹  Zanellato, O.⁴ 

[1] Malmo Univ, Mat Sci & Appl Math, Nordenskioldsgatan 1, S-20506 Malmo, Sweden

[2] Nelson Mandela Metropolitan Univ, Gardham Ave, ZA-6031 Port Elizabeth, South Africa

[3] Tech Univ Munich, Forsch Neutronenquelle Heinz Maier Leibnitz FRM 2, Lichtenbergstr 1, D-85747 Garching, Germany

[4] Ensam Cnam CNRS, PIMM, 151 Blvd Hop, F-75013 Paris, France

关键词: Zirconium hydride;    Phase transformation;    Neutron diffraction;    Hydrogen induced degradation;    High temperature hydrogen loading;    Deuterium;   

DOI  :  10.1016/j.jnucmat.2017.01.008

来源: Elsevier

【 摘 要 】

Deuteride phases in the zirconium-deuterium system in the temperature range 25-286 degrees C have been studied in-situ by high resolution neutron diffraction. The study primarily focused on observations of delta ->gamma transformation at 180 degrees C, and the peritectoid reaction alpha + delta <-> gamma at 255 degrees C in commetcial grade Zr powder that was deuterated to a deuterium/Zr ratio of one to one. A detailed description of the zirconium deuteride preparation route by high temperature gas loading is also described. The lattice parameters of alpha-Zr, delta-ZrDx and epsilon-ZrDx were determined by whole pattern crystal structure analysis, using Rietveld and Pawley refinements, and are in good agreement with values reported in the literature. The controversial gamma-hydride phase was observed both in-situ and ex-situ in deuterated Zr powder after a heat treatment at 286 degrees C and slow cooling. (C) 2017 Elsevier B.V. All rights reserved.

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