金属間化合物Ni₃Alの溶融紡糸法による製造法の検討

抄録

An advanced work processing, in-rotating-water spinning method has been applied for intermetallic compound Ni₃Al. In this method, which ejects a molten metal jet into the water layer formed on the inner surface of rotating drum, continuous filaments with round cross-section can be directly produced from molten Ni₃Al.
The effect of spinning conditions, especially spinning temperatures on the continuity and ductility of Ni₃Al filament have been examined. Ni₃Al filaments are annealed at 1033K and 1323K, and then the microstructures are observed. Only the sound filaments have been tensile tested at room temperature.
It is shown that a) the continuous and sound filaments are obtained when the temperature of molten metal ranges from 1900K to 1950K, b) the fine acicular microstructure in just as ejected condition changes to the hyperfine dendrite skeleton structure by 1033K annealing and returns to the coarse γ' single phase before spinning because of recrystallization when further annealed at 1323K, and c) the ultimate tensile strength decreases as the annealing temperature increases, while the ductility increases and shows the maximum elongation by 1033K annealing.