FABRICATION OF A Ni<sub>3</sub>Al/Al<sub>2</sub>O<sub>3</sub>UNIDIRECTIONAL COMPOSITE BY PRESSURE CASTING
Nourbakhsh, S.; Liang, F. L.; Margolin, H.; Nourbakhsh, S.; Department of Metallurgy and Materials Science, Polytechnic University; Liang, F. L.; Department of Metallurgy and Materials Science, Polytechnic University; Margolin, H.; Department of Metallurgy and Materials Science, Polytechnic University
Журнал:
Advanced Materials and Manufacturing Processes
Дата:
1988
Аннотация:
ABSTRACTA gas pressure liquid metal infiltration technique for producing fiber reinforced Ni<sub>3</sub>Al/Al<sub>2</sub>O<sub>3</sub> and Ni<sub>3</sub>Al/Al<sub>2</sub>O<sub>3</sub> composites has been described. Composite bars of 9.5 mm diameter, 150 mm long were produced. It was found necessary to add 0.5 at.%Ti to both Ni<sub>3</sub>Al and NiAl alloys to obtain adequate wetting. There was a strong tendency for liquid metal infiltration along one side of the fibers causing a shift of the fibers to the opposite side. No interface reaction zone was observed at optical magnifications up to 1000X. A composite of Ni<sub>3</sub>Al containing 33 volume percent of FP fibers fractured at 890 MPa which is approximately 3 times the yield strength of the matrix IC-50(21.73A1-0.34Zr-0.IB-Balance Ni at.%) + 0.5 at. %Ti.
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