کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1624393 1516419 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Formation of a tetragonal phase hydride in Ti-Mo-H system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Formation of a tetragonal phase hydride in Ti-Mo-H system
چکیده انگلیسی
The structural relationship between the hydride phases in Ti-Mo-H solid solution system (Mo content up to 15 at% in the alloy) during dehydrogenation process under annealing has been studied by conventional and in situ X-ray powder diffraction and transmission electron microscopy (TEM) analysis. During dehydrogenation, the saturated hydrides of the Ti-Mo alloys with fcc δ-phase structure transfer into bcc β-phase at higher temperatures. An associated hydrogen concentration reduction for the δ-phase hydride is observed in the process. However, as the hydrogen concentrations decrease to certain values (H/M ∼ 1.1-1.7), the unsaturated δ-phase formed at high temperature would become unstable at lower temperature, and transfer into a tetragonal phase (denoted the ɛ-phase here). Unlike that of the ɛ-phase in Ti-H system, the phase transition does not occur for the saturated δ-phase with hydrogen concentration close to the stoichiometric limit. The hydrogen concentration of this ɛ-phase hydride is in between that of the tetragonal γ and ɛ-phase in Ti-H system, but more close to the γ-phase. The occurrence region of this ɛ-phase expands along with the increase of the Mo content in the alloys. The phase has a lattice similar to that of the ɛ-phase in Ti-H system with corresponding fct unit-cell c/a < 1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 458, Issues 1–2, 30 June 2008, Pages 161-165
نویسندگان
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