Unidirectional solidification of Ni[sub 3]Al by a floating zone method
- National Research Inst. for Metals, Ibaraki (Japan)
The formation process of ductile, columnar-grained Ni[sub 3]Al with a stoichiometric composition was examined by unidirectional solidification (UDS) employing a floating zone (FZ) method, named FA-UDS method. Quenching the solidification interface results in Ni[sub 3]Al and [beta][sub 3]Al and [beta]-NiAl simultaneously growing from the liquid during FZ-UDS. The solidification interface morphology was lamellar at low growth rates and dendritic at high ones. The precipitated [beta]-NiAl is considered to prevent the grain growth of Ni[sub 3]Al perpendicular to the growth direction. In addition, at low growth rates [beta]-NiAl dissolved into the Ni[sub 3]Al matrix on cooling to room temperature, thereby leading to the columnar-grained structure of single phase Ni[sub 3]Al. At high growth rates, however, dendritic [beta]-NiAl remained undissolved when similarly cooled.
- OSTI ID:
- 6327740
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:6; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL COMPOSITION
CRYSTAL GROWTH
CRYSTALS
DATA
DENDRITES
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FABRICATION
GRAIN GROWTH
INFORMATION
INTERFACES
INTERMETALLIC COMPOUNDS
LAMELLAE
MELTING
MICROSCOPY
MORPHOLOGY
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL DATA
OPTICAL MICROSCOPY
PHASE TRANSFORMATIONS
PRECIPITATION
SEPARATION PROCESSES
SOLIDIFICATION
TRANSMISSION ELECTRON MICROSCOPY
ZONE MELTING