“…In order to improve the ductility of TiAl 3 phase, two types of approaches have been attempted. The first one is the microalloying of D0 22 structure with little success [2]. The second one, which is more popular, is to transform the D0 22 structure to the L1 2 structure by the addition of a number of transition elements, such as Cr, Mn, Fe, Ni, Cu [3e12] and Zn.…”