TEM investigation of the oxide scale of Ti-46.5Al-5Nb at 900°C for 50 h

被引：31
作者：
Lu, Wei
Chen, Chunlin
Xi, Yanjun
Guo, Changyou
Wang, Fuhui
He, Lianlong
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[2] Northeastern Univ, Coll Sci, Shenyang 110004, Peoples R China
[3] Zhongyuan Inst Technol, Dept Chem & Mat Engn, Zhengzhou, Peoples R China
[4] Chinese Acad Sci, Inst Met Res, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China
来源：
INTERMETALLICS | 2007年 / 15卷 / 5-6期
基金：
中国国家自然科学基金;
关键词：
titanium aluminides; based on TiAl; oxidation; electron microscopy; transmission;
D O I：
10.1016/j.intermet.2006.10.014
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：
In the present work, microstructure of oxide scale of Ti-46.5Al-5Nb oxidized for 50 h at 900 degrees C in air was investigated in both plane-viewed and cross-sectional samples using transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). In the TiO2 and Al2O3 mixture layer, orientation relationships (OR) between the Al2O3 and TiO2 phases were identified to be [1 (1) over bar 0](Al2O3)//[001](TiO2) and (001)(Al2O3)//(110)(TiO2), however, some misorientation existed at their interface. Besides, Nb enrichment was detected in the TiO2 phase in this layer but no Nb was found in the outer TiO2 layer. Al3Nb phase was identified between the oxide scale and TiAl base. This phase would promote TiAl oxidation protection due to hinder 'x' phase continuous formation. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：824 / 831
页数：8
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