Metallic bonding is a type of chemical bonding that occurs in metals. It is characterized by the sharing of electrons between metal atoms. This sharing of electrons creates a "sea" of electrons that flows throughout the metal. This sea of electrons is what gives metals their characteristic properties, such as their high electrical and thermal conductivity, as well as their malleability and ductility.

In AlNi, the aluminum and nickel atoms share electrons to form a metallic bond. This metallic bond is what holds the atoms together and gives AlNi its properties.