Article Title

Determination of stacking fault energies in a high-Nb TiAl alloy at 298 K and 1273 K

Authors

Xiping Song, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Lin Cao, Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China
Yanli Wang, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Junpin Lin, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Guoliang Chen, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

Corresponding Author

Xiping Song^1*

1 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

Recommended Citation

Song Xiping, Cao Lin, Wang Yanli, Lin Junpin, Chen Guoliang. Determination of stacking fault energies in a high-Nb TiAl alloy at 298 K and 1273 K, Int. J. Miner. Metall. Mater., 11 (2004), No. 1, p. 35-38.

Keywords

stacking fault energy; TiAl alloy; temperature; dislocation

Abstract

The stacking fault energies of Ti-46Al-8.5Nb-0.2W alloy at 298 K and 1273 K were determined. The principle for the determination of the stacking fault energies is based on the fact that the stacking fault energy and the elastic interaction energy acting on the dissociated partial dislocations are equal. After the compress deformations with the strain of 0.2% at 298 K and 1273 K, and water quench to maintain the dislocation structures deformed at 1273 K, the dissociation distances between two partial dislocations were determined by weak beam transmission electron microscopy (WBTEM) technique. Based on these dissociation distances and the corresponding calculation method, the stacking fault energies were determined to be 77-81 mJ/m² at 298 K and to be 57-60mJ/m² at 1273 K respectively.