1. Evolution of orientation distributions of γ and γ′ phases during creep deformation of Ni-base single crystal superalloys
- Author
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Hiroki Adachi, Norihiko L. Okamoto, Katsushi Tanaka, Haruyuki Inui, Tadaharu Yokokawa, Toru Inoue, Kyosuke Kishida, and Hiroshi Harada
- Subjects
Diffraction ,Materials science ,Polymers and Plastics ,Continuum mechanics ,Condensed matter physics ,Metals and Alloys ,Deformation (meteorology) ,Nickel alloys ,Electronic, Optical and Magnetic Materials ,Superalloy ,Crystallography ,Creep ,Dynamic phenomena ,Orientation (geometry) ,Ceramics and Composites ,Single crystal ,Mechanical energy - Abstract
The evolution of orientation distributions of γ and γ′ phases in crept Ni-base single crystal superalloys have been investigated by theoretical calculations with elastic–plastic models and by experiments. As creep deformation proceeds, the crystallographic orientation distributions for both phases are broadened as a result of the waving of the raft structure, which occurs to reduce the total mechanical energy. The broadening of the orientation distribution occurs in such a way that the 0 0 1 pole broadens isotropically while the h k 0 poles broaden preferentially along the left angle bracket0 0 1right-pointing angle bracket directions. Since the extent of the broadening increases almost linearly with the number of creep deformation, the measurement of the broadening by X-ray diffraction can be utilized in non-destructive methods to predict the lifetime of Ni-base superalloys.
- Published
- 2009