Microstructure and High-Temperature Oxidation Behavior of Dy-Doped Nb-Si-Based Alloys

被引：14

作者：

Guo, Yue-Ling ^{[1
]}

Jia, Li-Na ^{[1
]}

Zhang, Hua-Rui ^{[1
]}

Kong, Bin ^{[1
]}

Huang, Yong-Lin ^{[1
]}

Zhang, Hu ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

来源：

ACTA METALLURGICA SINICA-ENGLISH LETTERS | 2018年 / 31卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Nb-Si alloy; Intermetallics; Directional solidification; Oxidation; Microstructure; REACTIVE ELEMENT DOPANTS; 1200; DEGREES-C; CYCLIC OXIDATION; Y ALLOYS; COMPOSITES; RESISTANCE; AL; ADDITIONS; PHASE; TI;

D O I：

10.1007/s40195-018-0701-0

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Microstructures and oxidation behaviors of four Dy-doped Nb-Si-based alloys at 1250 degrees C were investigated. The nominal compositions of the four alloys are Nb-15Si-24Ti-4Cr-2Al-2Hf-xDy (at.%), where x = 0, 0.05, 0.10 and 0.15, respectively. Results showed that the four alloys all consisted of Nbss, alpha Nb5Si3 and gamma Nb5Si3, and the addition of Dy produced no obvious effect on the phase constitution and the microstructures of Nb-Si-based alloys. After oxidation at 1250 degrees C for 58 h, it was found that the addition of Dy accelerated the oxidation rate of Nb-Si-based alloys and caused a larger weight gain, accompanied by the formation of a more porous and less protective oxide scale. The oxides of Nb2O5, Ti2Nb10O29, TiNb2O7, Ti0.4Cr0.3Nb0.3O2 and glassy SiO2 were formed on Dy-doped Nb-Si-based alloys. The hightemperature oxidation mechanism of Dy-doped Nb-Si-based alloys was discussed.

引用

页码：742 / 752

页数：11

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