Processing and Mechanical Properties of Ti₃SiC₂: II, Effect of Grain Size and Deformation Temperature

Abstract

In this article, the second part of a two-part study, we report on the mechanical behavior of Ti 3 SiC 2 . In particular, we have evaluated the mechanical response of finegrained (3-5 µm) Ti 3 SiC 2 in simple compression and flexure tests, and we have compared the results with those of coarse-grained (100-200 µm) Ti 3 SiC 2 . These tests have been conducted in the 25°-1300°C temperature range. At ambient temperature, the fine-and coarse-grained microstructures exhibit excellent damage-tolerant properties. In both cases, failure is brittle up to ∼1200°C. At 1300°C, both microstructures exhibit plastic deformation (>20%) in flexure and compression. The fine-grained material exhibits higher strength compared with the coarse-grained material at all temperatures. Although the coarse-grained material is not susceptible to thermal shock (up to 1400°C), the finegrained material thermally shocks gradually between 750°a nd 1000°C. The results presented herein provide evidence for two important aspects of the mechanical behavior of Ti 3 SiC 2 : (i) inelastic deformation entails basal slip and damage formation in the form of voids, grain-boundary cracks, kinking, and delamination of individual grains, and (ii) the initiation of damage does not result in catastrophic failure, because Ti 3 SiC 2 can confine the spatial extent of the damage.

The M+1AX phases: Materials science and thin-film processing

“…The MAX phases deform by a combination of kink and shear band formation, together with delaminations within grains. Bulk Ti 3 SiC 2 is an unusually tough ceramic even at room temperature, because microcracking, delamination, crack deflection, grain push-out, grain pull-out and buckling of individual grains act as energy absorbing mechanisms during deformation [299,300]. This behavior is due to an anisotropic structure which renders basal plane dislocations mobile at room temperature, providing the ability to form kink bands under applied load [301].…”

Phase stability, elastic, electronic, thermal and optical properties of Ti3Al1−xSixC2 (0≤x≤1): First principle study

“…The compound is characterized by its high melting point, low density, excellent oxidation resistance, high strength at high temperatures, significant ductility, good electrical conductivity, and having self-lubrication and good machinability [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. These remarkable properties render Ti 3 AlC 2 a technologically interesting material and hold promise for applications in high temperature applications.…”

Structure and Bonding of Nanolayered Ternary Phosphides

“…The MAX phases are typical representatives of nanolaminated phases, and according to M. W. Barsoum et al [2,3], these phase characterized by high elastic moduli, are machinable [4], exhibit good damage tolerance [5], excellent thermal shock resistance [6], and good corrosion resistance [7], and they are good thermal and electrical conductors [4]. This unique combination of properties serves as motivation for fundamental as well as applied research.…”