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Isothermal (delta)/(alpha-prime) Transformation and Ttt Diagram in a Plutonium Gallium Alloy
A. J. Schwartz
M. A. Wall
K. M. Blobaum
B. P. Oudot
出版
United States. Department of Energy
, 2005
URL
http://books.google.com.hk/books?id=je-FAQAACAAJ&hl=&source=gbs_api
註釋
Differential scanning calorimetry (DSC) is used as an alternative approach to determining the tine-temperature-transformation (TTT) diagram for the martensitic delta to alpha-prime transformation in a Pu-2.0 at% Ga alloy. Previous work suggests that the TTT diagram for a similar alloy exhibits an unusual double-C curve for isothermal holds of less than 100 minutes. Here, we extend this diagram to 18 hours, and confirm the double-C curve behavior. When the sample is cooled prior to the isothermal holds, the delta to alpha-prime transformation is observed as several overlapping exothermic peaks. These peaks are very reproducible, and they are believed to be the result of different kinds of delta to alpha-prime martensitic transformation. This may be due to the presence of different nucleation sites and/or different morphologies.
