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 for three selected pseudoternary alloy systems (Ti3Al-Mo-Nb, Ti3Al-Nb-V and Ti3Al-Zr-V) show that the α2/α+β phase boundary obeys the electron concentration rule, and the valence electron number of the alloying elements depends on their own electronic structures. The valence electron for the transition elememts Ti, Zr, V, Mo, Nb, is s+d electron, i.e.NTi=Nzr=4(s2d2),Nv=5(s2d3), NNb=5(s1d4),Nmo=6(s1d5);the valence electron for the non-transition element Al is s+p electron, i.e.Nal=3(s2p1). The calculated model for a2 phase can be expressed as:N=ΣNifi,and the characteristic electron concentration for the α2/α+βphase boundary at 700℃may be expressed as .Nc=ΣNifi=3.787.Correspondent:(CUI Yuyou, Institule of Metal Research, Chinese Acadeiny of Sciences, Shenyang 110015)
参考文献
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