Formability, Phase Composition, and Microstructure of TiC-(5-50 wt %) NiCr-Based Materials Obtained by Free SHS Compression

The effect of the delay time before applying pressure on the formability of a TiC-(5-50 wt %) NiCr-based material and on its phase composition, unit cell parameters, and microstructure was experimentally studied by free SHS compression under conditions combining combustion and high-temperature shear deformation. It was shown that, with an increase in the relative density of the initial sample, the combustion temperature first rises and then sharply decreases. The mechanism of formation of the studied materials was determined at various quantitative contents of nichrome in the mixture. It was found that the optimal nichrome content in the mixture is 20-40 wt %, at which the strain of the material is maximum. The route of the synthesis of the initial reagents (titanium, carbon black, and nichrome) under free SHS compression was identified. It was detected that the synthesized material consists of TiC particles distributed in a matrix of Cr1.12Ni2.88 and Cr2Ni3. At >30 wt % nichrome in the mixture, a small amount of the unreacted titanium is observed, which can be controlled by the synthesis conditions.

Automated summary

The effect of the delay time before applying pressure on the formability and properties of TiC-NiCr-based material was studied in this research. It was found that the combustion temperature of the initial sample increased and then sharply decreased with the increase of relative density. The mechanism of material formation and the synthesis route of the initial reagents were identified.