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Strengthening of γ-TiAl-Nb by short-range ordering of point defects
- Source :
-
Intermetallics . Jun2011, Vol. 19 Issue 6, p793-796. 4p. - Publication Year :
- 2011
-
Abstract
- Abstract: The origin of the superior high temperature strength of Ti-rich γ-TiAl with addition of Nb is a highly controversial issue. In this paper, we calculated the interaction energies between point defects in these alloys using a first-principles plane-wave pseudopotential method. It is found that, the nearest neighbouring Nb atoms on Al-sublattice (NbAl) repel whereas the next nearest neighbouring NbAl atoms attract each other, indicating that NbAl atoms may form short-range ordered structure. Based on this finding, we propose that the short-range order may be responsible for the high strength of the Ti-rich TiAl-Nb alloys. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09669795
- Volume :
- 19
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Intermetallics
- Publication Type :
- Academic Journal
- Accession number :
- 60081392
- Full Text :
- https://doi.org/10.1016/j.intermet.2010.11.020