Mechanical Properties of Porous Ti₃SiC₂/TiC, Ti₃AlC₂/TiC and Ti₄AlN₃/TiN Nanolaminates-Composites at 20 to 1300 °C

Abstract

The microindentation, macrohardness, and uniaxial compression methods are used to examine the effect of porosity (5–35%), content of the second TiC or TiN phase (5–70 vol.% vol.), and loading temperature (between 20 and 1300 °C) on the mechanical properties of Ti₃SiС₂/TiС, Ti₃AlС₂/TiС, and Ti₄AlN₃/TiN nanolaminates–composites produced by reaction sintering of powder mixtures. A comparative analysis of the mechanical properties shows that the strength of the materials increases in the following sequence: Ti₃AlС₂/TiС, Ti₄AlN₃/TiN, and Ti₃SiС₂/TiС. Temperature–strain and force boundaries of their existence in the deformed state are established. Among all porous nanolaminates–composites investigated, Ti₃SiС₂ is the most optimal in respect of porosity, content of the other phase, and strength: 24% porosity and 30 vol.% titanium carbide.