Enhancing the oxidation resistance of Nb-Si based alloys by yttrium addition

被引：45
作者：
Guo, Yueling [1 ]
Jia, Lina [1 ]
Zhang, Huarui [1 ]
Zhang, Fengxiang [1 ]
Zhang, Hu [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
来源：
INTERMETALLICS | 2018年 / 101卷
关键词：
Intermetallics; Aero-engine components; Microstructure; Casting; Oxidation; DEGREES-C; MICROSTRUCTURE; TI; MECHANISM; BEHAVIOR; AL; IMPROVEMENT; FRACTURE; GE;
D O I：
10.1016/j.intermet.2018.08.004
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 gamma-Nb5Si3, relative to Nb solid solution (Nbss), Nb3Si and alpha-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.
引用
收藏
页码：165 / 172
页数：8
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