کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7988226 1515810 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhancing the oxidation resistance of Nb-Si based alloys by yttrium addition
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Enhancing the oxidation resistance of Nb-Si based alloys by yttrium addition
چکیده انگلیسی
The effect of yttrium on the microstructure and high-temperature oxidation performance of Nb-15Si-24Ti-4Cr-2Al-2Hf (at.%) alloys was investigated. Alloys containing different yttrium contents were designed, aiming at maximizing the beneficial effect of yttrium addition and avoiding the possible adverse effect of over-doped yttrium. Results showed that Y was primarily partitioned in γ-Nb5Si3, relative to Nb solid solution (Nbss), Nb3Si and α-Nb5Si3. Microstructural refinement and oxidation resistance enhancement were achieved by yttrium addition up to 0.3 at.%, accompanied by the transition towards parabolic oxidation kinetics. An adverse effect of over-doped yttrium (0.5 at.% addition) by coarsening the microstructure and deteriorating the oxidation resistance was confirmed. A relatively continuous glassy SiO2 layer was generated in the oxide scale formed on the Y-containing alloys with enhanced oxidation resistance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 101, October 2018, Pages 165-172
نویسندگان
, , , , ,