کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1644811 1517273 2014 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fundamental mechanism of tetragonal transitions in titanium hydride
ترجمه فارسی عنوان
مکانیسم مبنی بر انتقال تتراگونال در هیدرید تیتانیوم
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
چکیده انگلیسی


• Tetragonal transition of TiHx is divided into two types in terms of energy pathway.
• The intrinsic composition range of the δ→ε transition is 1.5≤x≤2.
• Mechanical instability causes δ→ε and internal symmetry breaking induces δ→γ.
• Poisson ratio of δ phases between x and z axes is proposed for tetragonal transitions.
• The present results could clarify the controversies about tetragonal transitions.

First principles calculation reveals that the tetragonal transitions of TiHx (1≤x≤2) could be divided into two types in terms of energy pathway, and that the intrinsic composition range of the δ→ε transition is 1.5≤x≤2. Calculation also indicates that the fundamental reasons for the δ→ε and δ→γ transitions are quite different from each other, i.e., mechanical instability causes the δ→ε transition and internal symmetry breaking of cubic structures induces the δ→γ transition. In addition, the Poisson ratio of δ phases between the x and z axes is proposed to provide a deeper understanding of intrinsic natures of tetragonal transitions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 115, 15 January 2014, Pages 252–255
نویسندگان
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