一、前 言 在沉淀析出第二相的固态反应中,为了使析出相应变能及与母相的界面能达最小,析出相一般呈球、片、针状形态。但是,近年来已有报导,在 Cu-Zn、Cu-Zn-Sn、Cu-Al、Ni-Si、Ni-Al等铜基与镍基合金中发现沉淀析出的第二相具有不同于常见形态的枝晶形貌。对于沉淀相形貌产生这种变化的原因还没有取得统一 I. Preface In the solid state reaction of precipitating the second phase, in order to make the corresponding energy of precipitation and the interfacial energy with the mother phase reach the minimum, the precipitates are generally in the form of spheres, sheets and acicular forms. However, it has been reported in recent years that the precipitation of the second phase in the copper-based and nickel-based alloys such as Cu-Zn, Cu-Zn-Sn, Cu-Al, Ni-Si, Dendrite morphology. The reasons for this change in the morphology of precipitated phases have not yet been uniformed