孙顺平,易丹青,陈振湘,周明哲,王斌

• 1:中南大学材料科学与工程学院

摘要(Abstract)：

制备了3种不同铒元素含量的Al-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Al-Mg-Si合金中的存在形式,并运用Miedema模型对Er在Al-Mg-Si合金中的热力学行为进行了分析。结果表明:在Al-Mg-Si合金中,Er元素的添加可以有效细化铸态晶粒,减小枝晶间距。Al-Mg-Si-Er合金凝固过程时可形成α(Al)+Er5Si3初生共晶组织,显微组织呈鱼骨状,合金中大量Er5Si3相的形成,使可时效析出的Mg2Si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Al-Er原子之间的亲和力,且铒硅二元金属间化合物生成焓负值更大,熔点更高,因此,在Al-Mg-Si-Er合金中,Er原子与Si原子优先形成铒硅相。

关键词(KeyWords)： Al-Mg-Si合金;铒;铸态组织;热力学分析;Miedema模型

Abstract:

Keywords:

基金项目(Foundation): 国家“973高性能铝材和铝资源高效利用基础研究”子课题(2005CB623705)

作者(Author): 孙顺平,易丹青,陈振湘,周明哲,王斌

DOI: 10.13289/j.issn.1009-6264.2011.01.026

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