|
Vol.43, No.6, 405 ~ 413, 2005
|
| Title |
| On the Crystallographic Features of Cr2N Precipitates in High-Nitrogen Austenitic Stainless Steel (4): TEM Study on the Order-Disorder Transition of Cr2N Precipitates during Electron Irradiation |
| 이태호 Tae Ho Lee , 오창석 Chang Seok Oh , 이창길 Chang Gil Lee , 김성준 Sung Joon Kim , 고목절웅 Setsuo Takaki |
|
|
|
| Abstract |
| In the fourth part of this study, the order-disorder phase transition of Cr2N precipitates during electron irradiation was investigated utilizing transmission electron microscopy (TEM). The superlattice reflections characterizing the ordered Cr2N superstructure gradually disappeared during electron irradiation in regular sequence: (001), (1/3 1/3 0) and (1/3 1/3 1), indicating that the order-disorder phase transition of Cr2N occurred. The convergent beam electron diffraction (CBED) observation revealed that the space group of disordered Cr2N was P63/mmc, and corresponded to the hcp sublattice of metal atoms with random distribution of nitrogen atoms in six octahedral interstices. The redistribution model of nitrogen atoms through the order-disorder phase transition was discussed in terms of the characteristics of superlattice reflections. |
|
|
| Key Words |
| Order-disorder transition, ODT, Electron irradiation, Superlattice reflections, TEM and convergent beam electron diffraction, CBED |
|
|
 |
|
