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Accurate Measurement of Lattice Misfit Between γ And γ' Phases in Nickel-Base Superalloys at High Temperatures

Published online by Cambridge University Press:  06 March 2019

Tadaharu Yokokawa ,
Katsumi Ohno ,
Hideyuki Murakami ,
Toshiharu Kobayashi ,
Toshihiro Yamagata  and
Hiroshi Harada
Tadaharu Yokokawa
Affiliation:
National Research Institute for Metals 1-2-1 Sengen, Tsukuba City, Ibaraki 305, Japan
Katsumi Ohno
Affiliation:
National Research Institute for Metals 1-2-1 Sengen, Tsukuba City, Ibaraki 305, Japan
Hideyuki Murakami
Affiliation:
National Research Institute for Metals 1-2-1 Sengen, Tsukuba City, Ibaraki 305, Japan
Toshiharu Kobayashi
Affiliation:
National Research Institute for Metals 1-2-1 Sengen, Tsukuba City, Ibaraki 305, Japan
Toshihiro Yamagata
Affiliation:
National Research Institute for Metals 1-2-1 Sengen, Tsukuba City, Ibaraki 305, Japan
Hiroshi Harada
Affiliation:
National Research Institute for Metals 1-2-1 Sengen, Tsukuba City, Ibaraki 305, Japan
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Abstract

Accurate measurement of the lattice misfit between the γ and γ phases in Ni-base single crystal superalloys at high temperatures has successfully been achieved using a parallel beam mode X-ray diffractometer with a high temperature specimen stage. The superalloys have γ' precipitates, an ordered FCC structure based on Ni3Al, in a γ-matrix having a disordered FCC structure (LI2). The parallel beam mode, the optics of which is made from a Ge (111) channel cut crystal, generates a superior monochromatic and parallel CuKα1 beam, which makes it possible to resolve a cluster peak in Ni-base superalloys into individual γ and γ ‘ peaks. This peak separation was almost impossible using the CuKα1+2 doublet beam from the standard type para-focusing mode, due to the very small difference in lattice parameters between the two phases.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 39: Forty-Fourth Annual Conference on Applications of X-ray Analysis, July 31 - August 4, 1995 , 1995 , pp. 449 - 456
Copyright
Copyright © International Centre for Diffraction Data 1995

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References

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