Abstract
Polycrystalline titanium silicon carbide (Ti 3SiC 2) samples with grain size of 20–50 μm were synthesized from 2Ti/2Si/3TiC powder at 1300 °C for 60 min through the pulse discharge sintering (PDS) technique. Compressive tests were conducted on the Ti 3SiC 2 specimens at temperatures up to 930 °C in vacuum. The results showed that the Ti 3SiC 2 specimens displayed obvious shear fracture behavior and monotonically decreasing fracture strength from 935 MPa (25 °C) to 640 MPa (930 °C). On the macro-scale, the shear fracture surfaces make an angle of 23–31° with respect to the stress axis. In micro-scale, the main deformation and damage modes consist of sliding, buckling and fracture of grains, kinking and intergranular cracking. The macro-shear fracture mechanism of Ti 3SiC 2 is quite analogous to other brittle materials, such as polycrystalline ice and bulk metallic glasses (BMGs). Based on the results available, the shear fracture mechanism of Ti 3SiC 2 is discussed and related to the behavior of other brittle materials.
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