Phase transformations during transient liquid phase sintering of iron titanium : A. Cias, T. Pieczonka (Academy of Mining and Metallurgy, Krakow, Poland)

Abstract

Coarse titanium powder was mixed with iron and carbon black powders, and the mixture was used for a combustion front quenching test. The quenched sample was analysed by scanning electron microscope and energy dispersive X-ray analyses to study the microstructural evolution of the titanium particles in the combustion synthesis. Also, the combustion temperature was measured, and the phase constituent of the combustion-synthesized product was inspected by X-ray diffraction. The results showed that the combustion reaction in Ti particles took place in the solid state and proceeded by the solid-state diffusion of C and Fe atoms into the Ti particles, forming in-situ composite of TiC–Fe. A ternary-reaction–diffusion model has been proposed to describe the microstructural evolution, and the use of the coarse Ti powder led to a residual phase FeTi.