Mechanical behavior of reactively hot-pressed aluminide matrix composite
- Osaka Univ., Ibaraki, Osaka (Japan). Inst. of Scientific and Industrial Research
FeAl and Ni{sub 3}Al matrix composites containing various fine particles were fabricated successfully by reactive hot-pressing. The strength and the fracture toughness of these composites at ambient temperatures were evaluated. The addition of {beta}-SiC particles was effective for strengthening of the Fe-40at%Al matrix, however, an extreme decrease of fracture toughness occurred due to the suppression of stress relaxation effect by plastic deformation at a crack tip. The fracture toughness of the reactively hot pressed Fe-40at%Al and its composites was also affected by the environmental embrittlement effect. TiB{sub 2} and ZrB{sub 2} particles in the Fe-40at%Al matrix composites were clarified to play a role in the reduction of the environmental effect. For the Ni-25at%Al matrix, higher flexural strength was achieved by the addition of TiB{sub 2}, TiC and TiN particles. TiB{sub 2} particles reacted with the matrix during hot-pressing. The Ni-25at%Al/TiB{sub 2} composite had a fracture strength of 1.5 GPa in spite of large grain size of the matrix. TiC and TiN were the best choices as effective reinforcing materials for the Ni{sub 3}Al matrix among the chemical compatible ones.
- OSTI ID:
- 571918
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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