کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1602259 1005240 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modelling of defects and amorphisation by ball milling of γ-TiAl
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Modelling of defects and amorphisation by ball milling of γ-TiAl
چکیده انگلیسی
The formation and site preference energies and volume changes of single and pair of defects of ternary alloying elements in γ-TiAl intermetallic compound were studied by the density functional theory. Slight tendency to clusterization of antisite defects has been found. This may lead to disorder in the system. The V and Cr atoms prefer to reside in the Ti sublattice. The formation energy for Cr-Cr, Cr-V and V-V nearest neighbour pairs are in the 1.3-2 eV range. The Al antisite in Ti sublattice requires much less energy than the Ti antisite in Al sublattice. The amorphisation process of TiAl alloy was studied by means of high energy ball milling of Ti and Al elemental powders, which produces amorphous structure after 40 h. The amorphous states were studied by the DFT calculations of many random atomic configurations and the results were compared with the NiAl compound. Possible explanation for the amorphisation of the TiAl compound is presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 14, Issue 12, December 2006, Pages 1397-1402
نویسندگان
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