对二元Fe-Al合金,含Cr和Si的Fe3Al合金的正电子寿命谱测量表明:随着二元Fe-Al合金中Al含量的增加,空位浓度增加,微孔洞的开空间增大.在Al含量高于40%(原子分数)的B2-FeAl合金中存在着较高的空位浓度和开空间相当于Fe中10-15个空位聚集体的微空洞.在B2-FeAl和D03 Fe3Al合金中,晶格中最邻近的Fe-Al原子对之间发生Fe d Al p杂化作用,Al的3p电子与Fe的3d电子被局域化并形成共价键,导致合金中的自由电子密度降低.二元Fe-Al合金中的平均电子密度随着Al含量的增加而下降.用Cr元素对Fe3Al进行合金化,合金基体和晶界处的自由电子密度均增加;而加入Si元素,合金基体和晶界处的自由电子密度均减小.讨论了Fe-Al合金的微结构对其力学性能的影响.
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