کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1618387 1005704 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An in situ neutron diffraction study of the thermal disproportionation of the Zr2FeD5 system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
An in situ neutron diffraction study of the thermal disproportionation of the Zr2FeD5 system
چکیده انگلیسی

The Zr2FeD5 system has been annealed to 680 °C under ultra high vacuum, and studied in situ by neutron diffraction. The system disproportionates through three distinct regions in temperature. Initially, the tetragonal Zr2FeD5 (P4/ncc) is retained up to 330 °C, while steadily depleted of D. From 330 °C to 530 °C, a complex multi-phase disproportionation occurs, with the production of cubic ZrD2, tetragonal ZrD2, tetragonal Zr2FeD5 (I4/mcm), and growth of the intermetallic ZrFe2. At the beginning of the 330–530 °C period, the total atom count from quantitative phase analysis (QPA) indicates the formation of amorphous (a-) Zr56Fe44. By 530 °C, QPA and peak breadth analysis indicate that ca. 2/3rd of the sample is consumed as very small nanocrystals (<150 Å coherence length) of strained ZrD2. From 530 °C to 680 °C, the cubic ZrD2 is almost entirely consumed and depleted of D to form the final mixture of the intermetallic phases Zr3Fe and ZrFe2. QPA of the final intermetallic mixture yields a Zr:Fe ratio greater than that observed in either the arc melted alloy or the initial Zr2FeD5 deuteride, indicating that a ca. Zr71Fe29 amorphous component was present in the initial arc melted alloy. According to the total atom count by QPA, crystallisation of the Fe richer amorphous Zr56Fe44 phase formed at 330 °C begins at ca. 530 °C, and later by 680 °C, all amorphous phases have completely crystallised to yield a 70.77:26.75:2.47 mol.% mixture of Zr3Fe:ZrFe2:ZrD2−x.


► Thermal disproportionation of classic tritium getter Zr2FeD5.
► In situ neutron diffraction, accurate quantitative phase analysis.
► Three distinct regions in temperature showing complex phase interactions.
► Production/crystallisation of amorphous Zr1−xFex phases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 509, Issue 18, 5 May 2011, Pages 5515–5524
نویسندگان
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