Abstract
The metastable Ti 2Al phase is usually formed in the Al-rich TiAl intermetallic compounds. The structure of this Ti 2Al phase and the relationship with TiAl(γ) and Ti 3 Al( α 2) phases were investigated. The Ti 2Al phase is hexagonal with lattice parameters a = 0.301 nm and c = 1.431 nm and stacking sequence AB'CBC'B. The interface between Ti 2Al and γ-phase is a geometric plane parallel to the {111} γ or (0001) Ti 2 Al. Along the γ-Ti 2Al interface some mismatch dislocations are arranged with a period of 4.2 nm. These mismatch dislocations have a half atomic plane in the γ-phase parallel to another {111} plane and do not form ledges along the interface. The Ti 2Al and α 2-plates often coexist in the γ-matrix and their interface is always parallel to the {101̄0} α2 plane. The atomic structure of the Ti 2Al phase and the characteristics of the α 2- Ti 2 Al interface may imply that the Ti 2Al phase is an interim phase during the transformation of the α 2-phase from the γ-phase and an outline model of this transformation mechanism is suggested.
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