Microstructure, wear and high temperature oxidation resistance of nitrided TiAl based alloys

被引：24
|
作者：
Sun, J [1 ]
Wu, JS [1 ]
Zhao, B [1 ]
Wang, F [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Key Lab High Temp Mat & Tests, Minist Educ, Shanghai 200030, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2002年 / 329卷
关键词：
titanium alummides; tribological properties; oxidation; coating;
D O I：
10.1016/S0921-5093(01)01515-5
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Gas nitridation of the TiAl based alloys in ammonia atmosphere was investigated in the present work. The scales of the nitrided alloys were characterized by X-ray diffraction (XRD) and electron probe microanalysis (EPMA). The evaluation of the surface hardness, wear and high-temperature oxidation resistance of the nitrided TiAl alloy was performed to compare with those of non-nitrided alloys. The results showed that the nitrided films composed of Ti2AlN as the inner layer and TiN as the outer layer on the surface of the alloys. Mechanical tests showed that the nitridation could obviously increase the surface hardness and the sliding wear resistance of the TiAl alloys. However, owing to the limited thermodynamical stability of the nitrides at high temperature in air, nitridation prior to the oxidation increased the high temperature oxidation rates of the TiAl alloys. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：713 / 717
页数：5
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