Review, Role of L1₂ Modified (Al_1-xMe_x)₃Ti Intermetallic Compounds on Heterogeneous Nucleation of Alpha Aluminum Grains

Al₃Ti intermetallic compound with the tetragonal D0₂₂ structure undergoes a phase transformation to the high-symmetry L1₂ cubic structure by addition of third elements, Me. The lattice constants of some L1₂ modified (Al_1-xMe_x)₃Ti intermetallic compounds are closed to that of alpha aluminum , e.x., the lattice constants of L1₂ modified A1_2.7Fe_0.3Ti, A1_2.75Ni_0.25Ti and A1_2.5Cu_0.5Ti intermetallic compounds are a = 0.393 nm, a =0.394 nm and a = 0.3927 nm, respectively.. Therefore, it is expected that the addition of L1₂ modified (Al_1-xMe_x)₃Ti intermetallic compound particles show good grain refining performance of cast aluminum. In this paper, our recent results on novel refines containing heterogeneous nucleation site particles of L1₂ modified (Al_1-xMe_x)₃Ti intermetallic compounds have been reviewed.