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在钛与钢的连接界面处,由于母材组元的相互扩散和反应,形成了TiFe和TiFe2金属间化合物,对接头性能影响很大。运用固体与分子经验电子理论,计算TiFe和TiFe2的价电子结构和共价键键能,并从价电子结构层次分析TiFe和TiFe2热稳定性和脆性。结果表明:TiFe2比TiFe具有更牢固的共价键络,因此其热稳定性更好;TiFe和TiFe2的脆性因子均小于0.08,表现为本征脆性。
At the interface of titanium and steel, TiFe and TiFe2 intermetallic compounds are formed due to mutual diffusion and reaction of matrix components, which has a great influence on the joint performance. The valence electron structures and covalent bond energies of TiFe and TiFe2 were calculated using the empirical electron theory of solids and molecules. The thermal stability and brittleness of TiFe and TiFe2 were analyzed from the valence electron structure. The results show that TiFe2 has a more stable covalent bond than TiFe, so its thermal stability is better. The brittleness factors of TiFe and TiFe2 are all less than 0.08, indicating the intrinsic brittleness.