运用固体经验电子理论(EET),对Al-Li-Zr合金的价电子结构进行计算.结果表明:Zr与Al原子存在强烈的相互作用,在固溶体中形成Al-Zr偏聚区.Al-Zr原子的偏聚析出的细小Al3Zr粒子,均匀弥散分布在基体中,起到抑制晶粒长大,细化Al3Li晶粒的作用.Al3Zr和Al3(Zr,Li)粒子具有较强的Al-Zr共价键,不易被位错的切割折断,因而对位错的运动有较大的阻力,对合金起到强化作用.另一方面,共格复合相Al3(Zr,Li)的析出,可以降低共格界面错配度,使得界面键合强度分布较均匀,对提高基体的韧性是有益的.
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