Oxidation resistance of TiAl alloy treated by plasma Nb-C alloying

被引：10
|
作者：
Guo, Chaoli [1 ]
Liu, Xiaoping [1 ,2 ]
Ben, Haifeng [1 ]
He, Zhiyong [1 ]
机构：
[1] Taiyuan Univ Technol, Res Inst Surface Engn, Taiyuan 030024, Peoples R China
[2] Univ Sci & Technol Beijing, Dept Mat Phys & Chem, Beijing 100083, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2008年 / 202卷 / 09期
基金：
中国国家自然科学基金;
关键词：
TiAl alloy; plasma alloying; plasma carburization; oxidation resistance;
D O I：
10.1016/j.surfcoat.2007.07.086
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
in this paper, the duplex treatment of plasma surface niobizing and carburization (Nb-C alloyed or duplex treated) has been performed on TiAl substrates. Cyclic-oxidation tests for untreated and duplex treated TiAl were carried out in static air at 900 degrees C for 103 h. The mass gain due to oxidation was measured using an electrobalance. The chemical compositions of the Nb-C alloyed layer as well as its microstructure were examined by glow discharge spectrum (GDS) and the optical microscopy (OM). The electronic diffraction spectrum (EDS) and scanning electronic microscopy (SEM) were used to analyze and observe the oxide layers. The phase structures of the oxide scale were identified by X-ray diffraction (XRD). The results show that the oxidation rate of the duplex treated TiAl specimens decreased significantly, compared with the untreated TiAl. The roles of duplex treatment for improving the oxidation resistance are discussed. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：1797 / 1801
页数：5
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