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 oC in flowing NH3 to produce reddish-brown amorphous/nanocrystalline materials. The precursors were then densified at 2 GPa and 200-700 oC 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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1747-1762 |
| Number of pages | 16 |
| Journal | Materials |
| Volume | 4 |
| Issue number | 10 |
| DOIs | |
| State | Published - 2011 |
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Keywords
- High pressure
- Metal nitrides
- Microhardness
- Nanocomposite materials
- Nanoindentation
- Synthesis
- TiN
ASJC Scopus subject areas
- Materials Science(all)
Cite this
Mechanical Properties of Titanium Nitride Nanocomposites Produced by Chemical Precursor Synthesis Followed by High-P,T Treatment. / Bailey, Edward; Ray, Nicole M T; Hector, Andrew L.; Crozier, Peter; Petuskey, William; McMillan, Paul F.
In: Materials, Vol. 4, No. 10, 2011, p. 1747-1762.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mechanical Properties of Titanium Nitride Nanocomposites Produced by Chemical Precursor Synthesis Followed by High-P,T Treatment
AU - Bailey, Edward
AU - Ray, Nicole M T
AU - Hector, Andrew L.
AU - Crozier, Peter
AU - Petuskey, William
AU - McMillan, Paul F.
PY - 2011
Y1 - 2011
N2 - 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 oC in flowing NH3 to produce reddish-brown amorphous/nanocrystalline materials. The precursors were then densified at 2 GPa and 200-700 oC 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.
AB - 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 oC in flowing NH3 to produce reddish-brown amorphous/nanocrystalline materials. The precursors were then densified at 2 GPa and 200-700 oC 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.
KW - High pressure
KW - Metal nitrides
KW - Microhardness
KW - Nanocomposite materials
KW - Nanoindentation
KW - Synthesis
KW - TiN
UR - http://www.scopus.com/inward/record.url?scp=84555163045&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84555163045&partnerID=8YFLogxK
U2 - 10.3390/ma4101747
DO - 10.3390/ma4101747
M3 - Article
AN - SCOPUS:84555163045
VL - 4
SP - 1747
EP - 1762
JO - Materials
JF - Materials
SN - 1996-1944
IS - 10
ER -