Effect of Al content and Nb addition on the strength and fault energy of TiAl alloys

被引:68
作者
Zhang, WJ
Appel, F
机构
[1] GKSS Forschungszentrum Geesthacht GmbH, Mat Res Inst, D-21502 Geesthacht, Germany
[2] Beijing Univ Sci & Technol, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2002年 / 329卷
关键词
intermetallic compounds; dislocations; TEM; yield strength; fault energy;
D O I
10.1016/S0921-5093(01)01663-X
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The yield strengths of Ti-45Al-xNb and Ti-49Al-xNb (x = 0, 10) with a nearly-equiaxed gamma microstructure were measured at 900 degreesC. Nb addition was found to largely increase the yield strengths but the variation of Al content has little influence on the yield strength of binary TiAl alloys. To understand the strengthening effect of Nb, the stacking fault energies in these alloys were measured using weak-beam transmission electron microscope (TEM) techniques. The SISF energy decreases significantly with the decreasing of Al content of gamma phase in binary alloys but is practically independent of the Al content in ternary alloys. The implications of the dissociation behavior on the mechanical properties of the material will be discussed. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:649 / 652
页数:4
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