利用透射电子显微镜(TEM)在Fe-Ni-V-C合金中观察到一些马氏体核胚,核胚的结构为特殊的位错组态:Burgers矢量为1/2[011]fcc,且一端为封闭的发夹型位错,和在发夹型位错内塞税的、Burgers矢量为1/2[110]fcc的位错列。它们分别提供了马氏体相变所必须的二次切变。
The butterfly martensite nuclei in an Fe-Ni-V-C alloy were observedunder TEM to consist of the enveloping dislocations with Burgers vector 1/2[011]_(fcc)and the arrays of dislocations with Burgers vector 1/2[110]_(fcc) piled up within theformers. The enveloping dislocations and the arrays of dislocations provide the re-quired shear when the planes (111)_(fcc) move over each other to alter their stackingorder and change into the planes (110)_(bcc) respectively. The neccessary adjustment ofthe spacings is provided by the dislocations in martensite. The crystallographic rela-tionship after double-shear is K-S one.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%