Deformation mechanism of long-period TiAl 2 |
| |
Authors: | Changhui Lei |
| |
Institution: | Beijing Laboratory of Electron Microscopy, Institute of Physics and Center of Condensed Matter Physics , Chinese Academy of Sciences , PO Box 603, Beijing, 100080, PR China |
| |
Abstract: | The microstructure of long-period TiAl 2 deformed at room temperature has been studied by means of transmission electron microscopy. Dislocations, stacking faults and twins were found to contribute to the deformation. A screw superdislocation with Burgers vector d 110] dissociates into two ½ d 110] super-partial dislocations associated with an antiphase boundary. The ½; d 110] super-partial dislocation further dissociates into two Shockley partial dislocations associated with a portion of complex intrinsic stacking fault on the closest-packed {111} plane. The propagation of stacking faults on successive {111} planes yields an order twin. |
| |
Keywords: | |
|
|