Dissociation of super-dislocations and the SISF energy in γ-TiAl based alloy with Nb-doping, as studied by HRTEM
- 165 Downloads
The dissociation of super-dislocations in γ-TiAl in Nb-doped Ti-48 at.% Al-5 at.% Nb has been studied by high resolution transmission electron microscopy (HRTEM). The SISF energy in γ-TiAl in Ti-48 at.% Al-5 at.% Nb was calculated to be 35 mJ/m2 according to the dissociation width. It is concluded that Nb addition may affect the electronic structure of TiAl and furthermore decrease SF energies in TiAl alloys, which is partly responsible for the strengthening effect of Nb-doping.
KeywordsHigh Resolution Transmission Electron Microscopy High Resolution Transmission Electron Microscopy Burger Vector Stack Fault Energy Critical Resolve Shear Stress
This work was jointly supported by the Chinesisch-Deutsches Zentrum für Wissenschaftsförderung (Beijing) and National Basic Research Program of China through Grant No.2004CB619305. The authors would like to thank Dr. J.G. Zheng. and Dr. G.H. Cao for their help and enlightening discussions.