Microstructures of rapidly solidified powder and extruded rod of Ni{sub 3}Ge
- Dartmouth Coll., Hanover, NH (United States). Thayer School of Engineering
Rapidly solidified powders and extruded rods of Ni{sub 3}Ge with and without 0.06 at. % boron were characterized using optical microscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The powders were generally spherical and exhibited both dendritic and lamellar structures. The increase in lattice parameter per atom fraction of boron, {var_epsilon}, was estimated to be 0.33. Extrusion of the powders produced fine grains of about 2 {micro}m in diameter. The extruded materials were partially recrystallized and showed a minor preference for [111] orientation. Annealing at 950 C resulted in a fully recrystallized structure and a nearly random orientation. The addition of 0.06 at. % boron had no observable effect on the morphology, microstructure, and texture. Precipitates of borides were observed in the annealed boron-doped alloy, suggesting that the solubility of boron in Ni{sup 3}Ge may be below about 0.06 at. %.
- OSTI ID:
- 409672
- Journal Information:
- Materials Characterization, Vol. 37, Issue 1; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NICKEL ALLOYS
EXTRUSION
MICROSTRUCTURE
GERMANIUM ALLOYS
BORON ADDITIONS
INTERMETALLIC COMPOUNDS
OPTICAL MICROSCOPY
SCANNING ELECTRON MICROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
DENDRITES
LAMELLAE
LATTICE PARAMETERS
GRAIN SIZE
ANNEALING
RECRYSTALLIZATION
GRAIN ORIENTATION
PRECIPITATION