Atomistic modeling of the interaction between matrix dislocation and interfacial misfit dislocation networks in Ni-based single crystal superalloy
Atomistic modeling of the interaction between matrix dislocation and interfacial misfit dislocation networks in Ni-based single crystal superalloy
复制标题
镍基单晶高温合金中基体位错与界面失配位错网络之间相互作用的原子建模
DOI：
10.1016/j.commatsci.2012.10.037
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发表时间：
2013-04
影响因子：
3.3
通讯作者：
Minsheng Huang
中科院分区：
文献类型：
--
作者：
Yaxin Zhu;Zhenhuan Li;Minsheng Huang
为了揭示镍基单晶高温合金的内在强化机制，采用分子动力学（MD）方法模拟了基体位错与界面错配位错网络之间的相互作用。结果表明，界面位错网络的作用是非常复杂的。一方面，界面位错网络可以作为位错汇吸收/容纳基体位错。在网络对基体位错的容纳过程中，形成了界面Lomer-Cottrell锁和α [100]位错结，使界面位错网络稳定和强化。另一方面，界面位错网络可以提供位错钉扎，阻止基体位错切入γ′相。这些钉扎在相界面上的基体位错段可以作为Frank-Read源，其长度约为位错网络间距的一半，为位错网络间距对镍基单晶高温合金蠕变强度的影响提供了解释。
To reveal the intrinsic strengthening mechanism in Ni-based single crystal superalloy, the interaction between matrix dislocations and interfacial misfit dislocation networks was modeled in this contribution via molecular dynamics (MD) method. Our results show that the role of interfacial dislocation networks is very complex. On the one hand, the interfacial dislocation networks can act as dislocation sinks to absorb/accommodate the matrix dislocations. During the accommodation process of matrix dislocation by the networks, both the interfacial Lomer–Cottrell locks and a[100] dislocation junctions are formed, which stabilize and strengthen the interfacial dislocation networks. On the other hand, the interfacial dislocation networks can provide dislocation pins to prevent the matrix dislocations from cutting into the γ′ precipitate. These matrix dislocation segments pinned at the phase interface can serve as Frank–Read sources with their length being about half of the dislocation network spacing, providing an explanation for the effect of dislocation network spacing on the creep strength of the Ni-based single crystal superalloy.
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影响因子：
1.6
作者：
Christopher Kohler;T. Link;A. Epishin
通讯作者：
Christopher Kohler;T. Link;A. Epishin
DOI：
10.1007/s11661-008-9520-7
发表时间：
2008-04
期刊：
Metallurgical and Materials Transactions A
影响因子：
--
作者：
L. Carroll;Q. Feng;T. Pollock
通讯作者：
L. Carroll;Q. Feng;T. Pollock
影响因子：
1.6
作者：
Wenping Wu;Ya-Fang Guo;Yuesheng Wang
通讯作者：
Wenping Wu;Ya-Fang Guo;Yuesheng Wang
影响因子：
1.6
作者：
Y. Sun;P. Hazzledine;M. Crimp;A. Couret
通讯作者：
Y. Sun;P. Hazzledine;M. Crimp;A. Couret
影响因子：
9.4
作者：
Mishin, Y
通讯作者：
Mishin, Y