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对Ｔｉ_３－Ｍｏ－Ｎｂ，Ｔｉ_３Ａｌ－Ｎｂ－Ｖ，Ｔｉ_３Ａｌ－Ｚｒ－Ｖ三个赝三无合金系的实验结果表明，α_２／α_２＋β相界遵守电子浓度规律，且合金元素的价电子数由它们的电子结构决定过渡族元素Ｔｉ，Ｚｒ．Ｖ，Ｍｏ，Ｎｂ的价电子为ｓ＋ｄ电子。即Ｎ_（Ｔｉ）＝Ｎ_（Ｚｒ）＝４（ｓ~２ｄ~２），Ｎ_ｖ＝５（ｓ~２ｄ~３），Ｎ_（Ｎｂ）＝５（ｓ~１ｄ~４），Ｎ_（Ｍｏ）＝６（ｓ~１ｄ~５）、非过渡族元素Ａｌ的价电子为ｓ＋ｐ电子，即Ｎ_（Ａｌ）＝３（ｓ~２ｐ~１）α_２相的计算模型为Ｎ＝ΣＮ_ｉｆ_ｉ，α_２／α_２＋β相界的特征电子浓度值为Ｎ_ｃ＝ΣＮ_ｉｆ_ｉ＝３．７８７．
The experimental results on the three pseudo-three-non-alloying systems of Ti_3-Mo-Nb, Ti_3Al-Nb-V and Ti_3Al-Zr-V indicate that the α_2 / α_2 + β phase boundaries obey the electron concentration law and the valence numbers of the alloying elements are determined by their Electronic structure determines the transition group elements Ti, Zr. The valence electrons of V, Mo, Nb are s + d electrons. That is, N Ti Ti N = 4 s ~ 2d ~ 2, N_v = 5 s ~ 2d ~ 3, N Nb 5 ~ s ~ 1d ~ 4, Mo = (S ~ 1d ~ 5), the valence electron of the non-transition group element is s + p electron, that is the calculation model of α_2 phase of N_ (Al) = 3 (s_2p_1) is N = ΣN_if_i, α_2 / α_2 + β phase boundary The characteristic electron concentration value is N_c = ΣN_if_i = 3.787.