Abstract
A stray grain exposed on the surface of a Re-containing single crystal Ni-based superalloy turbine blade was examined by high-resolution analytic electron microscopy. An intermediate layer with the size range of 3 to 4 μm, composed of elongated γ′ phase, was clearly detected forming a boundary between a normal matrix grain and a stray grain. Beyond the intermediate layer, the {100} direction of the γ′ phase in the matrix changed slightly, and a stray grain was formed. In each γ′ grain in the intermediate boundary, a Re-rich region of the size range of 100 to 200 nm was detected, suggesting a role for rhenium in the formation of stray grains.
Original language | English |
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Pages (from-to) | 1024-1029 |
Number of pages | 6 |
Journal | Metallurgical and Materials Transactions A |
Volume | 46 |
Issue number | 3 |
Early online date | 20 Dec 2014 |
DOIs | |
Publication status | Published - Mar 2015 |
ASJC Scopus subject areas
- Condensed Matter Physics
- Metals and Alloys
- Mechanics of Materials