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Chemical and Structural Characterization of γ/γ′ Interfaces

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Abstract:

More attention has been paid to the interfaces since mechanical properties of nickel-base superalloys are determined to some degree by them. The compositional transition across γ/γ′ interfaces and atomic structure of the interfaces was investigated using three-dimensional atom probe tomography and scanning transmission electron microscope equipped with high-resolution Energy Dispersive X-ray Spectrometry. Results show that no obvious segregation to the interfaces or ledges of the precipitates in the present experimental alloys has been observed. Also, adsorption of a solute to the interface was not observed. The interfaces are not flat as usually thought at an atomic scale. The interfacial thickness is about two atomic layers, i.e. 0.7 nm.

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Advanced Materials Research II View Preview

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Periodical:

Advanced Materials Research (Volumes 463-464)

Pages:

20-24

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.463-464.20

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Online since:

February 2012

Authors:

Kai Zhao

Keywords:

Interface, Scanning Transmission Electron Microscope, Three-Dimensional Atom Probe Tomography

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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