What is formed by combining two or more metals?

The correct choice is the term for a specific material created by combining two or more metals. An alloy is a solid solution of metals or a combination of metals with other elements. When metals are mixed together, their properties can be altered, leading to enhanced characteristics such as increased strength, ductility, resistance to corrosion, and improved mechanical properties. Common examples of alloys include brass (made from copper and zinc) and steel (made from iron and carbon).

While terms like composite and blend might refer to combinations of materials in broader contexts, they do not specifically capture the union of metals in the same way an alloy does. A composite typically refers to a material made from two or more constituent materials with significantly different physical or chemical properties. A mixture refers to a physical combination where the individual components retain their identities. Thus, alloy is the most precise term that accurately describes the combination of metals to form a new material with specific attributes.