کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1610345 1516275 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Crystal structure and phase stability of AlSc in the near-equiatomic Al-Sc alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Crystal structure and phase stability of AlSc in the near-equiatomic Al-Sc alloy
چکیده انگلیسی
Intermetallic compound AlSc is found in the equiatomic Al-Sc binary alloy. The present work indicates that the orthorhombic AlSc with the Au2CuZn-type structure can be formed at 50 at.% Sc, while the CsCl-type (B2) AlSc will be formed at 55 at.% Sc. After annealing at 1100 °C, some orthorhombic AlSc grains transit to the B2 structure, and the annealing at lower temperatures leads to the disappearance of B2 phase, indicating that the B2 AlSc is also a metastable phase in the alloy at lower Sc content (<50 at.%). First-principle calculations at 0 K reveal that the orthorhombic AlSc is more stable than the B2 AlSc with the energy difference between them being 5.4 meV/atom. The fast transition between these two phases, which cannot be interpreted by the mechanism of atomic diffusion, was tentatively analyzed by the volume change based on the calculated atomic positions of these two phases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 618, 5 January 2015, Pages 192-196
نویسندگان
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