Ti-Al系金属间化合物力学性能的电子理论

应用固体与分子经验电子理论，在价电子结构层次，系统地研究了Ti-Al系金属间化合物的力学性能.根据该理论的基本思想，比较了相关平行电子理论由电荷密度对力学性能的处理方法，模型化了价电子结构空间分布图象，揭示了Ti-Al系金属间化合物的脆性本质.据此提出了能反映金属间化合物均匀变形能力的价电子结构对称性形因子α，表明α与塑性有很好的对应关系，并给出了其脆性判据.初步建立了价电子结构与力学性能定量的经验关系. 关键词：

ELECTRON THEORY OF MECHANICAL PROPERTIES OF INTERMETALLICS IN Ti-Al ALLOY SYSTEM

The mechanical properies of intermetallics in Ti-Al alloy system are studied systematically from the view point of valence electron by the empirical electron theory (EET). First, according to the basic thinking of the EET, space topology of valence electron structure is modelled, and the embrittlement nature of intermetallics in Ti-Al system is concisely brought to light. Second, the valence electron structure symmetry factor α, which has a good relationship to the plasticity is proposed from the model, and the embrittlement criterion is summed up. Finally, the empirical relation between valence electron structures and mechanical properties can be established.