材料期刊网

在前文的研究基础上,本文研究了过渡族元素在Ti-Al-Sc,Ti-Al-V,Ti-Al-Nb和Ti-Al-Mo四个三元合金系中Ti,X相形成中的行为。 实验结果表明:在含有过渡族元素Sc,V,Nb和Mo的Ti-Al固溶体中,Ti_3X相的形成仍然遵守电子浓度规律,且过渡族元素的价电子数是由它们的d能带结构决定的。对周期表中位于Ti左侧的Sc,N_(sc)=2(s~2);对周期表中位于Ti右侧的V,Nb和Mo,N_v=3(d~3),N_(Nb)=4(d~4),和N_(Mo)=5(d~5)。另外,实验结果还表明:合金中添加任何一种过渡族元素都不可能对Ti,X相的形成有抑制作用。

Four ternary alloy systems, including Ti-Al-Sc, Ti-Al-V, Ti-Al-Nb and Ti-AlMo, other than previous work, were selected to investigate the behaviour of transition elements in the formation of Ti_3X-phase. Results show that the formation ofTi_3X-phase in the Ti-Al solid solution containing the transition elements Sc, V, Nb or Mo obeys the electron concentration rule as well, and the valence electron number of the transition elements depends on the structures of their d energy bands, i.e., N(Sc)=2(S~2) for the elements, e.g. Sc, on the left of Ti in the periodic table; N_v=3(d~3), N_(Nb)=4(d~4) and N_(Mo)=5(d~5) for the elements V, Nb and Mo on the right of Ti, respectively. Furthermore, it seems that the formation of Ti_3X-phase could not be'restrained by an addition of any transition element to the alloy.