摘要
Ti-Al-V,Ti-Al-Mo和Ti-Al-Nb合金系的实验结果表明,ω相的形成是遵守电子浓度规律的。过渡族元素Ti,V,Mo,Nb的价电子数分别为4(s^2d^2),5(s^2d^3),6(s^1d^5),5(s^1d^4)非过渡族元素Al的价电子数为3(s^2p^1)。此外,合金元素的化学负电性和原子半径对ω相的形成也有影响。综合合金元素的价电子数、化学负电性和原子半径三个因素,钛合金中ω相形成的特征值可定为4.223,其表达式为4.223=∑Nf_i+0.310Δx/x_(Ti)+0.551Δr/r_(Ti)
The experimental results for three selected ternary alloy systems: Ti-Al-V,
Ti-Al-Mo and Ti-Al-Nb show that the formation of ω-phase obeys the electron concentra-
tion rule. The valence electron number is N_(Ti)=4(s^2d^2), N_v=5(s^2d^3), N_(Mo)=6(s^1d^5),
N_(Nb)=5(s^1p^4) for the transition elements Ti, V, Mo, Nb, respectively, and N_(Al)=3(s^2p^1) for the
non-transition element Al. Furthermore, the electronegativities and atomic radii of the al-
loying elements will still have some influence upon the ω-phase formation. Sythesizing the
valence electron number, electronegativity and atomatic radius of the alloying element, the
characteristic value may be fixed at 4.223 in Ti alloy, and which may be expressed as
4.223=∑N_if_i+0.310△x / x_(Ti)+0.551 △r / r_(Ti)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第2期A061-A067,共7页
Acta Metallurgica Sinica
关键词
Ω相
化学负电性
钛合金
电子密度
ω-phase
Ti-alloy
electron concentration
electronegativity
atomic radius
