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Neutron diffraction topography observation of a Ni-based superalloy single crystal

✍ Scribed by H. Tomimitsu; K. lijima; K. Aizawa; A. Yoshinari

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
204 KB
Volume
213-214
Category
Article
ISSN
0921-4526

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✦ Synopsis

Neutron diffraction topography was successfully applied to the characterization of a prototypal turbine blade made from a Ni-based superalloy single crystal by the bypass method. The preliminary results are as follows: (1) In spite of the complicated structure, the present turbine blade is a "single crystal" with lattice constants of around 0.364 nm. (2) A (00 1)-dendritic substructure was suggested along the macroscopic growth direction, i.e. vertical, in the main part, while horizontal in the branch part. (3) The recombination of the branch part to the main part was found to be much nearer to the main part than scheduled. An angular misfit more than 0.5 Β° from the main part was detected at the recombination position, and seemed to start at the branch-originating stage. (4) The FWHM of the rocking curve varied as a function of the wavelength used.

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