Behavior and mechanisms of deformation in intermetallic compound Al₆₆Mn₉Ti₂₅+La

The influence of lanthanum on the microstructure, deforming behavior, and microcrack susceptibility of intermetallic compound Al₆₆Mn₉Ti₂₅ was investigated. After adding lanthanum into the intermetallic compound Al₆₆Mn₉Ti₂₅, the lattice parameters are not changed and the L1₂ structure is maintained. At the same time, the dendritical grain and the fine second phase are obtained, which inhibits the microcrack initiation and the intergranular failure. On the other hand, the movability of dislocation is enhanced, and the compressive ductility is improved. The mechanism about the role of lanthanum in the intermetallic compound Al₆₆Mn₉Ti₂₅ was discussed.