The optical observation results of neocrystallization nucleation and growth of fine fully-lamellar α 2/γ microstructure of the TiAl-based alloy in the rapid heating cyclic heat treatment process are described The characteristics of α+γ→α transformation under the rapid heating conditions are analyzed The degree of superheating occurs and it increases with increasing heating rate; the transformation rate increases with heating rate and the transformation is completed in a certain temperature range A mo...