On the interphase boundaries between the matrix and the precipitate y '( Ag2Al) ( 0001), electronic density is continued in Al-Ag binary alloy. The functions of aging hardening are remarkable in the alloy. Al一Ag二元合金在时效过程中的亚稳相尸(AgZAI)相(。001)面的界面与基体一Al(111)面的面电荷密度连续,对合金起到了强化的作用。