Study of γ/γ′ interfacial width in a nickel-based superalloy by scanning transmission electron microscopy

Abstract

The γ/γ′ interfaces are thought to play an important role in determining the mechanical properties in single-crystal nickel-based superalloys. In this article, interfacial width in DD6, one second-generation single-crystal superalloy containing 2 wt% Re, has been studied by means of scanning transmission electron microscopy. From an atomic resolution high angle annular dark field image, both compositional interfaces and order–disorder interfaces are studied, and it is first found that the interfacial width of chemical composition is same with that between the ordered and disordered phases.

Keywords:

• interface
• nickel-based superalloy
• scanning transmission electron microscopy

Acknowledgements

This work is financially supported by National 973 Project of China and Chinese National Nature Science Foundation. This work made use of the resources of the Beijing National Center for Electron Microscopy at Tsinghua University.