Observations of temperature stability of γ-zirconium hydride by high-resolution neutron powder diffraction
Författare
Summary, in English
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.
Publiceringsår
2015
Språk
Engelska
Sidor
55-61
Publikation/Tidskrift/Serie
Journal of Alloys and Compounds
Volym
661
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Materials Engineering
Nyckelord
- Metal hydrides
- Phase transitions
- Neutron diffraction
- Zirconium hydride
- Zirconium
- Nuclear materials
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0925-8388