＜正＞The electron structure ofγ/α2 phase boundaries in lamellar colonies in Ti-47Al-2M（M=Nb, Cr, V） （mole fraction, %） alloys was theoretically investigated by Empirical Electron Theory of Solid and Molecules （EET） and the bond-length-difference （BLD） method. Average-Atom-Model was employed to calculate valence electron structure of TiAl intermetallics containing site substitution elements. On this basis, the boundary condition of electron movement was employed in the improved Thomas-Fermi-Dirac （TFD） theory to decide the continuity of the electron density of the lamellar colonies interface and it is found that ofγ/α2 interface is continuous（Δρ＜10%）. Furthermore, it is found that adding alloying elements （including Nb, Cr, and V） can improve the electron density （ρ） ofγ/α2 interfaces, and decrease the electron density difference（Δρ）ofγ/α2 interfaces. Adding V element decreasingΔρis more remarkable than other site substitution elements. According to electron structure study ofγ/α2 interfaces in Ti-47Al-2M alloys, the added elements improve mechanical properties of the alloy in the following order: V＞Cr＞Nb.
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