In situ x-ray diffraction study of the δ→α isothermal martensitic transformation kinetics in a Pu-Ga alloy
Journal Article
·
· Journal of Nuclear Materials
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
- Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab., High Pressure Synergetic Consortium (HPSync)
The sequence of phase formation and the isothermal kinetics of the δ to α' phase transformation in a Pu–1.9 at.% Ga alloy are investigated with in situ X-ray diffraction at the Advanced Photon Source. It has been proposed that the formation of a γ' intermediate phase may be responsible for the unusual double-C curve kinetics reported for this isothermal martensitic transformation. While a γ' intermediate phase was not observed at either -120 °C or -155 °C, an unexplained shoulder on the δ (1 1 1) peak was detected at -155 °C. The isothermal kinetics of the δ → α' transformation appear to fit a Johnson–Mehl–Avrami–Kolmogorov equation, but the exponent is not described by existing JMAK theory. The double-C curve kinetics of the δ to α' transformation remain unresolved in plutonium science, and understanding this behavior is key to predicting phase stability in aging Pu–Ga alloys.
- Research Organization:
- Energy Frontier Research Centers (EFRC); Energy Frontier Research in Extreme Environments (EFree)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- SC0001057
- OSTI ID:
- 1065544
- Journal Information:
- Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: 3 Vol. 412; ISSN 0022-3115
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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