<正> 一、前言 应用透射电子显微镜(TEM)技术观察金属薄膜的断裂过程,最早的可能是Wilsdorf的金属Al薄膜的工作.以后,Forsyth和Wilson,Kuhlman-Wilsdorf等人分别对Al-4％Cu的合金,Cu单晶体薄膜中的裂纹扩展进行了TEM的直接观
In situ observations of the behavior of void formation and dislocations formed ahead of a crack in a spheroidized low carbon steel have been carried out during fracture tests with TEM. The results show that the fracture occurs through alternate processes of nucleation, growth and coalescence of voids during plastic deformation. Void coalescence generally associates with the necking of matrix metal between the voids. Most frequetly, the cracks are in a zigzag shape. The deformation on the two sides of a zigzag crack does not match microscopically with each other. Dislocations may emit from the crack tip when the crack is either propagating or blunting. The dislocation emission is the main cause of the crack blunting. The effect of dislocation distribution on the void formation has also been discussed.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%