Formation and role of dislocation networks during high temperature creep of a single crystal nickel–base superalloy
- 作者：Sugui ; Tian ; Huihua ; Zhou ; Jinghua ; Zhang ; Hongcai ; Yang ; Yongbo ; Xu ; Zhuangqi ; Hu
- 关键词：Single crystal nickel&ndash ; base superalloy ; Dislocation reaction ; Dislocation networks
- 刊名：Materials Science and Engineering ; A
- 出版年：2000
- 期刊代码：61_09215093
- 类别：ms
- 出版时间：February 29, 2000
- 卷：279
- 期：1-2
- 页码：160-165
- 文件大小：1.01 M
摘要
An investigation has been made into the formation and role of dislocation networks during high temperature creep in a single crystal nickel–base (Ni---Al---Mo---Ta) superalloy. The results show that the three-dimension networks in the matrix channels are formed by the reaction of dislocations during primary creep. It is found that these three-dimension networks formed at the interfaces play an important role in accommodation of the strain hardening and the recovery softening during steady state creep. However, in the tertiary creep stage, the main deformation feature of the alloy is the shearing of the γ′ rafts by the moving dislocations in matrix from the γ′/γ phase interfaces where the dislocation networks are damaged.