Processing and Heat Treatment Effects on an Al2O3/Ni3Al Composite |
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| Authors: | PC Brennan WH Kao JM Yang |
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| Affiliation: |
a Mechanics and Materials Technology Center The Aerospace Corporation, Los Angeles, CA
b Department of Materials Science and Engineering, University of California, Los Angeles, CA |
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| Abstract: | Various processing routes may be used to fabricate Ni3Al matrix composites. In the present study, vacuum hot pressing and hot extrusion were used to fabricate an Al2O3 Composite particulate-reinforced Ni3Al composite. Relatively low extrusion temperatures promoted gamma-phase formation as did extended high temperature anneals. The room-temperature bend strength was found to increase as the gamma-phase content increased. Furthermore, the composite creep rate was affected by the. processing parameters and their effect on the amount of gamma/pgamma-prime interface. The matrix and particulates did not exhibit any reaction after normal processing. However, a minor reaction was noted after annealing near 1000°C, while extensive reaction resulting in Ni-Al spinel formation occurred above 1200°C in air |
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