Effect of Nb on oxidation behavior of high Nb containing TiAl alloys
Effect of Nb on oxidation behavior of high Nb containing TiAl alloys
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Nb对高Nb TiAl合金氧化行为的影响
DOI：
10.1016/j.intermet.2010.08.029
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发表时间：
2011-02-01
期刊：
影响因子：
4.4
通讯作者：
Chen, G. L.
中科院分区：
文献类型：
--
作者：
Lin, J. P.;Zhao, L. L.;Chen, G. L.
研究了Ti-45 Al-8 Nb和Ti-52 Al-8 Nb合金在900 ℃空气中的等温氧化行为。用XPS和AES研究了其早期氧化行为。利用XRD和SEM对氧化膜的微观结构和成分进行了分析。结果表明，Nb的加入显著改善了TiAl合金的氧化行为。Nb作为5价阳离子取代TiO 2中的Ti，从而抑制TiO 2生长。富（Ti，Nb）O-2层是致密的和化学均匀的，其比TiO 2层更具保护性。Nb的添加也降低了临界Al含量，以形成外部氧化铝。高Nb含量的TiAl合金在氧化物/金属界面处的金属基体中形成Nb 2Al相。(C)2010爱思唯尔有限公司版权所有。
The isothermal oxidation behavior of Ti-45Al-8Nb and Ti-52Al-8Nb alloys at 900 degrees C in air was investigated. The early oxidation behaviors were studied by using XPS and AES. And the microstructure and the composition of the oxidation scale were studied by using XRD and SEM. The results show that the oxidation behavior of TiAl alloy is significantly improved by Nb addition. Nb substitutes for Ti in TiO2 as a cation with valence 5, and thus to suppress TiO2 growth. The (Ti,Nb)O-2-rich layer is a dense and chemically uniform which is more protective than the TiO2 layer. Nb addition also lowers the critical Al content to form an external alumina. Nb2Al phase is formed in the metallic matrix at the oxide metal interface on the high Nb containing TiAl alloys. (C) 2010 Elsevier Ltd. All rights reserved.