利用扫描电镜背散射电子技术、透射电子显微镜观察及能谱成分分析,研究在400℃时效处理过程中,不同Zn含量对铸态MgGd3Nd0.3Znx(x=0～1.25,at%,下同)系列合金中析出相和长周期堆垛(LPS)结构形成的影响.结果表明:在时效处理过程中,当Zn含量x≤0.62的合金中初生第二相附近的镁基体中析出平衡相β,而初生第二相则相对稳定无明显变化;当Zn含量x≥1.06时,合金镁基体中无β相析出,初生第二相开始瓦解,并在第二相与镁基体间形成一个含有高密度层错和LPS结构的富Zn和稀土元素的过渡区域.通过对不同Zn含量合金中第二相、过渡区以及镁基体中的成分对比分析,探讨高Zn含量Mg-Gd-Nd-Zn合金中LPS结构的形成原因及生长过程.
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