Fracture Behavior and Microstructure of Ti 3AlC2 Ceramics Prepared by SHS/PHIP Method
Fracture behavior and the microstructure of Ti3AlC2 ceramics prepared by SHS/PHIP method were studied. Stress-strain curves at different temperature with a strain rate of 1×10-3 s-1 were obtained. Fracture toughness, flexural strength, crack propagation behavior and compressive deformation of specimens were investigated. Results show that the microstructure of the large size Ti3AlC2 ceramics prepared by SHS/PHIP method has typical layered feature of ternary carbide compound. The bridge-link phenomena induced by the flaky grains occurred in three-point bending test. It restrained the crack propagation and improved the fracture toughness of the material. Cylindrical specimens under axial compression usually smashed into chips for most of the ceramics materials, however, for the Ti3AlC2 ceramics prepared by SHS/PHIP, shear fracture along 45º incline of the specimen occurred at room temperature, and bulging deformation without any crack exhibited when temperature was high. It is concluded that the Ti3AlC2 ceramics prepared by SHS/PHIP has better fracture-resistance properties.
H.S. Lee, I.S. Yoon and M.H. Aliabadi
Z. Y. Ren et al., "Fracture Behavior and Microstructure of Ti 3AlC2 Ceramics Prepared by SHS/PHIP Method", Key Engineering Materials, Vols. 385-387, pp. 177-180, 2008