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- Title
Laser-Deposited In Situ TiC-Reinforced Nickel Matrix Composites: 3D Microstructure and Tribological Properties.
- Authors
Borkar, Tushar; Sosa, John; Hwang, Jun; Scharf, Thomas; Tiley, Jaimie; Fraser, Hamish; Banerjee, Rajarshi
- Abstract
A new class of Ni-Ti-C-based metal-matrix composites has been developed using the laser-engineered net shaping™ process. These composites consist of an in situ formed and homogeneously distributed titanium carbide (TiC) phase reinforcing the nickel matrix. Additionally, by tailoring the Ti/C ratio in these composites, an additional graphitic phase can also be engineered into the microstructure. Serial-sectioning, followed by three-dimensional reconstruction of the microstructure in these composites, reveals homogeneously distributed primary and eutectic titanium carbide precipitates as well as a graphitic phase encompassing the primary carbides within the nickel matrix. The morphology and spatial distribution of these phases in three dimensions reveals that the eutectic carbides form a network linked by primary carbides or graphitic nodules at the nodes, which suggests interesting insights into the sequence of phase evolution. These three-phase Ni-TiC-C composites exhibit excellent tribological properties, in terms of an extremely low coefficient of friction while maintaining a relatively high hardness.
- Subjects
TITANIUM carbide; COMPOSITE materials; NICKEL; CARBIDES; TRIBOLOGY
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2014, Vol 66, Issue 6, p935
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-014-0907-1