Nickel aluminide,Ni₃Al,is sometimes used as a strengthening constituent in high-temperature nickel-base superalloys.It is approximately 13.3% aluminum (r = 143 pm)and 86.7% nickel (r = 124 pm).Ni₃Al is best classified as ________

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Nickel aluminide is an intermetallic compound, not an alloy. It consists of a regular arrangement of atoms in a crystal lattice, with specific stoichiometry and composition. Therefore, it cannot be classified as substitutional or interstitial alloy, which involve the addition of impurity atoms in a metallic matrix.

Nickel Aluminide,Ni3Al,is Sometimes Used as a Strengthening Constituent in High-Temperature

Nickel Aluminide,Ni₃Al,is Sometimes Used as a Strengthening Constituent in High-Temperature