Fe3B

Fe3B is an iron boride intermetallic compound that forms as a hard, brittle phase in iron-boron systems. It appears primarily in cast iron, steel, and iron-boron alloys where it contributes to hardness and wear resistance, though its brittleness limits use in applications requiring toughness. The material is valued in wear-resistant coatings, hard-facing applications, and as a reinforcing phase in composite materials, though it is typically encountered as a constituent phase rather than a primary engineering material.