制备了3种不同饵元素含量的AI-Mg-Si合金,利用显微组织观察(OM)、扫描电镜(SEM)、能谱分析(EDS),X射线衍射物相分析(XRD)、硬度测试与差热分析(DSC)等分析测试手段,研究元素Er在AI-Mg-Si合金中的存在形式,并运用Miedema模型对Er在AI-Mg-Si合金中的热力学行为进行了分析.结果表明:在AI-Mg-Si合金中,E:元素的添加可以有效细化铸态晶粒,减小枝晶间距.AI-Mg-Si-Er合金凝固过程时可形成α(Al)+ Er5 Si,初生共晶组织,显微组织呈鱼骨状,合金中大量Er_5 Si_3相的形成,使可时效析出的Mg_2Si相减少,合金硬度值减小.原子亲和力和金属间化合物生成焓的计算结果显示Er-Si原子之间的亲和力大于Mg-Er和AI-Er原子之间的亲和力,且饵硅二元金属间化合物生成焓负值更大,熔点更高,因此,在AI-Mg-Si-Er合金中,Er原子与Si原子优先形成饵硅相.
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