High-Temperature Mechanical Properties of Titanium Carbide

Abstract

High-temperature mechanical properties of titanium carbide were investigated by compression at high temperatures from 1073 K to 2273 K, using single crystals, radiofrequency-melted polycrystals, arc-melted polycrystals and sintered materials.
The brittle to ductile transition temperature of TiC_0.88 single crystals is about 1150 K and they show almost unlimited ductility above about 1450 K. Their active slip plane is {1\bar11} in a wide orientation range of specimens, but it becomes {100} when compressed along the ⟨111⟩ direction. The critical resolved shear stress evaluated by assuming the slip direction to be ⟨011⟩ is about 2 times higher for {100} slip than for {1\bar11} slip. The yield stress of these materials decreases exponentially with temperature. The stress in the investigated temperature range is higher in the order of sintered, arc-melted, radio frequency-melted and single crystals, and the transition temperature is higher in this order as well.