Slip geometry of dislocations related to cutting of the γ′ phase in a new generation single-crystal superalloy
Slip geometry of dislocations related to cutting of the γ′ phase in a new generation single-crystal superalloy
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DOI：
10.1016/s1359-6454(03)00355-0
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发表时间：
2003-10
期刊：
影响因子：
9.4
通讯作者：
J. X. Zhang;T. Murakumo;Y. Koizumi;Toshiharu Kobayashi;H. Harada
中科院分区：
文献类型：
--
作者：
J. X. Zhang;T. Murakumo;Y. Koizumi;Toshiharu Kobayashi;H. Harada
研究了第四代TMS-138单晶高温合金在不同温度下137 MPa应力下蠕变断裂后γ′相中的超位错。在1100 ~ 1150 °C范围内，随着蠕变温度的升高，滑移位错的数量增加。γ′相的主要切割方式是通过反相界（APB）耦合的位错对。γ′相的超位错具有螺旋特征，Burgers矢量为<0 1 1>或<1 0 1>。 在γ′相中还观察到[110]或[11 <$0]方向的60°或螺型超位错以及[001]刃型超位错。 从超位错的解离可以看出层错。这些超位错与高温合金中筏状结构的损伤有关。
The superdislocations in the γ′ phase of a fourth-generation single-crystal TMS-138 superalloy have been characterized after creep rupture at a stress of 137 MPa under different temperatures. The number of slip dislocations increases with the increase of creep temperatures from 1100 to 1150 °C. The dominant cutting mode of the γ′ phase is dislocation pairs coupled by an antiphase boundary (APB). The popular superdislocations in the γ′ phase show screw character with Burgers vectors <0 1 1> or <1 0 1>. Also, observed in the γ′ phase are 60° or screw superdislocations in either [1 1 0] or [1 1 ̄ 0 ] directions, and [0 0 1] edge superdislocations. Stacking faults are seen from the dissociation of superdislocations. These superdislocations are related to the damage of the rafted structure in the superalloy.