期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(01)01763-4
关键词
intermetallic compounds; dislocations; TEM; lattice defects
Weak-beam transmission electron microscope (TEM) analyses of 1/2<112> superdislocations were performed in order to determine the stacking fault energies in Ti-45Al, Ti-49Al, Ti-45Al-10Nb and Ti-49Al-10Nb alloys (at.%) at 900 degreesC. In Al-lean binary TiAl alloys, the SISF energies decrease significantly with decreasing Al concentration in the gamma phase, from 97 mJ m(-2) for 49.6% Al to 64 mJ m(-2) for 48% Al. The ternary alloys exhibit a relatively low SISF energy of about 68 mJ m(-2), which is practically independent of the Al concentration. (C) 2002 Elsevier Science B.V. All rights reserved.
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