Enhancing the oxidation resistance of Nb-Si based alloys by yttrium addition
作者： Yueling Guo , Lina Jia , Huarui Zhang , Fengxiang Zhang , Hu Zhang
DOI: 10.1016/J.INTERMET.2018.08.004
关键词:
摘要: Abstract The effect of yttrium on the microstructure and high-temperature oxidation performance Nb-15Si-24Ti-4Cr-2Al-2Hf (at.%) alloys was investigated. Alloys containing different contents were designed, aiming at maximizing beneficial addition avoiding possible adverse over-doped yttrium. Results showed that Y primarily partitioned in γ-Nb5Si3, relative to Nb solid solution (Nbss), Nb3Si α-Nb5Si3. Microstructural refinement resistance enhancement achieved by up 0.3 at.%, accompanied transition towards parabolic kinetics. An (0.5 at.% addition) coarsening deteriorating confirmed. A relatively continuous glassy SiO2 layer generated oxide scale formed Y-containing with enhanced resistance.
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