Feti

FeTi is a designation used in metallurgy to denote two related but distinct materials: a binary intermetallic compound of iron and titanium, and a ferroalloy known as ferrotitanium.

FeTi as an intermetallic compound refers to the equiatomic FeTi phase that occurs in the iron–titanium system. It commonly crystallizes in the CsCl-type (B2) structure, an ordered body-centered cubic arrangement in which iron and titanium occupy alternate sites. It forms by solid-state diffusion in equiatomic mixtures of Fe and Ti and is stabilized at elevated temperatures. The FeTi intermetallic is typically hard and has a high melting point, but exhibits brittleness and limited ductility, especially at room temperature. Its practical use is mainly in research on high-temperature materials and as a reference phase in phase-diagram studies rather than as a bulk structural material.

FeTi as a ferroalloy refers to ferrotitanium, an iron–titanium alloy used in steelmaking as a deoxidizer and grain refiner. Commercial ferrotitanium grades usually contain around 60–70 percent titanium by weight, with the balance iron and small impurities. It is produced by alloying iron with titanium-bearing materials in an electric arc furnace or by other smelting routes. When added to molten steel, ferrotitanium supplies titanium to form stable Ti-containing phases, improves inclusion control, and refines the grain structure, while also acting as an alloying addition that can influence mechanical properties and hardenability. High Ti content can increase cost and affect machinability.