Abstract After just yielding at room temperature, the deformation mechanisms in the Ni-base superalloys Rene N5, CMSX-4, PWA 1483, and CM247LC are investigated by transmission electron microscope. It is found that anti-phase boundary shearing controls the initial plastic deformation of Rene N5, CMSX-4 and PWA 1483, although stacking fault shearing also operates in the latter two alloys. Whereas, besides many pairs of a/2 〈110〉 dislocations, a high density of isolated superlattice stacking faults and extended stacking faults is also created in CM247LC after around 0.2% plastic deformation, indicating that stacking fault shearing prevails in the initial stage of plastic deformation. These observations demonstrate that plastic deformation is not accomplished solely by anti-phase boundary shearing in Ni-base single crystal superalloys at room temperature, and the formation of superlattice stacking faults does not necessarily require reordering of atoms, hence providing new insights into understanding the interaction mechanisms between matrix dislocations and γ' precipitates.

中文翻译：

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<112>{111}滑移在镍基高温合金室温初始塑性变形中的作用

摘要 通过透射电子显微镜研究了室温刚屈服后的镍基高温合金Rene N5、CMSX-4、PWA 1483和CM247LC的变形机制。发现反相边界剪切控制了 Rene N5、CMSX-4 和 PWA 1483 的初始塑性变形，尽管层错剪切也在后两种合金中起作用。然而，除了许多对 a/2<110> 位错之外，CM247LC 在大约 0.2% 的塑性变形后还产生了大量孤立的超晶格堆垛层错和扩展的堆垛层错，表明在塑性初始阶段，堆垛层错剪切占主导地位。形变。