Microstructure and mechanical properties of Ni{sub 3}Al-based alloy/TiC composites
Book
·
OSTI ID:78345
- Chinese Academy of Sciences, Shenyang (China). Inst. of Metal Research
The microstructure and mechanical properties of Ni{sub 3}Al-based composites reinforced with TiC particles have been investigated. The composites, which contained 2, 6, 10 vol.% TiC particulate reinforcement, were fabricated by solidification processing method. The matrix alloy selected for this study was the advanced nickel-aluminide (Ni-16Al-8Cr-1Zr-0.8Mo-0.04B at.%).The optical micrographs revealed that the carbides in the composites distributed uniformly in the matrix and appeared as fairly equiaxed particles. SEM observation showed that the interface between TiC and matrix is quite smooth, sharp and free of any phase. The test results indicated that the hardness was increased with increasing volume fraction of TiC particles at ambient temperature, and the composites exhibited higher hardness after 1,100 C {times} 8h heat treatment. The yield strength has been improved due to reinforcement by the TiC particles at ambient and elevated temperature, but their ductility was reduced obviously. From SEM fractography, it could be seen that tensile failure occurred at the matrix/particulate interface.
- OSTI ID:
- 78345
- Report Number(s):
- CONF-941144--; ISBN 1-55899-265-0
- Country of Publication:
- United States
- Language:
- English
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