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 thenon-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 thevalence electron number, electronegativity and atomatic radius of the alloying element, thecharacteristic value may be fixed at 4.223 in Ti alloy, and which may be expressed as4.223=∑N_if_i+0.310△x / x_(Ti)+0.551 △r / r_(Ti)
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%