کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1600173 | 1515870 | 2013 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Stability of the Nb5Si3 phase in the Nb-Mo-Si system
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
Phase equilibrium between the α-Nb5Si3 and β-Nb5Si3 phases has been studied in the Nb-Mo-Si ternary system. The high temperature β-Nb5Si3 phase is stabilized by Mo additions to yield a relatively narrow α/β two-phase field in the Nb-Mo-Si ternary system. The enthalpy of the α-β phase transformation has been evaluated from the experimentally determined two-phase field boundaries lines in Nb-xMo-37.5Si (x = 0-10) alloys as 21 (±3) kJ/mol-atom. The β-Nb5Si3 phase exhibits a temperature dependent solubility, which results in the formation of Nbss precipitates both in the α- and β-Nb5Si3 matrices. The orientation relationship between Nbss and Nb5Si3 has been identified by transmission electron microscopy. Lattice parameter variation of the β-Nb5Si3 phase suggests that the departure of the β-Nb5Si3 phase from stoichiometry toward (Nb + Mo) compositions is derived from the anti-site substitution of Nb and Mo atoms for Si sites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 41, October 2013, Pages 104-112
Journal: Intermetallics - Volume 41, October 2013, Pages 104-112
نویسندگان
N. Sekido, K. Hildal, R. Sakidja, J.H. Perepezko,