کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7062444 | 1459519 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effects of thermal conditioning and recovery processes on the δâγ phase transformation mechanisms in plutonium
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The behaviour of plutonium on cooling from the δ-phase has still not been fully resolved. A number of studies by differential scanning calorimetry (DSC) and dilatometry on the δâγ phase transformation have reported the unusual behaviour of this transformation and have proposed a range of very plausible explanations for the mechanism based on the conditions examined. The current study, which has been conducted over a much wider range of experimental conditions, shows new evidence indicating that the transformation is influenced by recovery processes that occur in the δ-phase. The transformation will adopt a different mechanism depending on the condition and thermal history of a specimen. The transformation may be measured by DSC, for specimens subjected to different thermal conditioning, as a barely visible undulation in the baseline, a series of well defined discrete peaks extending over a large temperature range or as this work demonstrates a single defined peak. This study also shows evidence that the plutonium phase transformations on cooling are unlikely to strictly follow the sequential transformations that mirror the phase transformations on heating. A mixed sequential and serial phase transformation route is proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 565, 10 August 2013, Pages 151-158
Journal: Thermochimica Acta - Volume 565, 10 August 2013, Pages 151-158
نویسندگان
S.M. Ennaceur,