Review, Role of L1 ₂ Modified (Al _1?x Me _x) ₃Ti Intermetallic Compounds on Heterogeneous Nucleation of Alpha Aluminum Grains

摘要

Al_(3)Ti intermetallic compound with the tetragonal D0_(22)structure undergoes a phase transformation to the high-symmetry L1_(2)cubic structure by addition of third elements, Me. The lattice constants of some L1_(2)modified (Al_(1?x) Me _(x))_(3)Ti intermetallic compounds are closed to that of alpha aluminum. Therefore, it is expected that the addition of L1_(2)modified (Al_(1?x) Me _(x))_(3)Ti 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 L1_(2)modified (Al_(1?x) Me _(x))_(3)Ti intermetallic compounds have been reviewed.