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根据Hume Rothery规律和相稳定性与电子结构的关系,对合金元素的原子特性进行考查,发现Ti与Al,Ga,In,Sn,Zr的原子半径和负电性相近。这是合金化的有利因素。因此推断,电子浓度是控制α-Ti_3X相界的主要因素。对Ti-Al-Ga,Ti-Al-Sn,Ti-Al-Zr,Ti-Al O四个三元合金系的实验表明:Ti_3X相的形成是遵守电子浓度规律的,且合金元素的价电子数是由它们的电子结构决定的。对过渡族元素Ti,Zr价电子数为N_(Ti)=N_(Zr)=2;对非过渡族元素Al,Ga,Sn,O价电子数分别为N_(Al)=N_(Ga)=3(s~2p~1),N_(Sn)=4(s~2p~2),N_o=6(s~2p~4)。Ti_3X相形成的特征电子浓度可表示为(?)_c=∑Nifi=2.12。
According to the law of Hume Rothery and the relationship between phase stability and electronic structure, the atomic properties of alloying elements were examined and found that the atomic radii and the negative charges of Ti, Al, Ga, In, Sn and Zr were similar. This is a favorable factor for alloying. Therefore, it is inferred that the electron concentration is the main factor controlling the phase boundary of α-Ti_3X. Experiments on four ternary alloys of Ti-Al-Ga, Ti-Al-Sn, Ti-Al-Zr and Ti-AlO show that the formation of Ti_3X phase complies with the electron concentration law and the valence electrons The numbers are determined by their electronic structure. The valence number of Ti and Zr for the transition group is N Ti = N Zr 2. The valence numbers of the non-transition group elements Al, Ga, Sn and O are N Al = N Ga = 3 (s ~ 2p ~ 1), N_ (Sn) = 4 (s ~ 2p ~ 2) and N_o = 6 (s ~ 2p ~ 4). The characteristic electron concentration formed by Ti_3X phase can be expressed as (?) _ C = ΣNifi = 2.12.