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- Title
Mechanical Properties of Titanium Nitride Nanocomposites Produced by Chemical Precursor Synthesis Followed by High-P,T Treatment.
- Authors
Bailey, Edward; Ray, Nicole M. T.; Hector, Andrew L.; Crozier, Peter; Petuskey, William T.; McMillan, Paul F.
- Abstract
We investigated the high-P,T annealing and mechanical properties of nanocomposite materials with a highly nitrided bulk composition close to Ti3N4. Amorphous solids were precipitated from solution by ammonolysis of metal dialkylamide precursors followed by heating at 400-700 °C in flowing NH3 to produce reddish-brown amorphous/nanocrystalline materials. The precursors were then densified at 2 GPa and 200-700 °C to form monolithic ceramics. There was no evidence for N2 loss during the high-P,T treatment. Micro- and nanoindentation experiments indicate hardness values between 4-20 GPa for loads ranging between 0.005-3 N. Young's modulus values were measured to lie in the range 200-650 GPa. Palmqvist cracks determined from microindentation experiments indicate fracture toughness values between 2-4 MPa·m1/2 similar to Si3N4, SiC and Al2O3. Significant variations in the hardness may be associated with the distribution of amorphous/crystalline regions and the very fine grained nature (∼3 nm grain sizes) of the crystalline component in these materials.
- Subjects
TITANIUM nitride; NANOCOMPOSITE materials; HIGH pressure (Science); MICROHARDNESS; AMORPHOUS substances; CRYSTALS; MECHANICAL behavior of materials
- Publication
Materials (1996-1944), 2011, Vol 4, Issue 10, p1747
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma4101747