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应用M ssbauer谱 ,X射线衍射 (XRD)和差式扫描量热法 (DSC)研究了颗粒弥散的快速凝固Al 4.3Fe 0 .7V 1.7Si 1.0Nd(摩尔分数 ,% )合金中纳米相的转变和相变动力学 ,并用Arrami公式X =1-exp(-Ktn)计算了纳米相转变的激活能。结果表明 :快速凝固纳米合金在加热过程中发生Al8Fe4 Nd相向α Al13 (Fe,V) 3 Si相转变 ,α Al13 (Fe,V) 3 Si相生成所需的激活能E =(2 .48± 0 .0 9)eV ,与Fe原子在α Al中的扩散激活能相一致 ,说明α Al13 (Fe ,V) 3 Si相的形核长大主要由Fe原子的体扩散控制。
The transformation of nanophase in the rapidly solidified Al 4.3Fe 0.7V 1.7Si 1.0 Nd (mole fraction) alloy with dispersed particles was investigated by M ssbauer spectroscopy, X-ray diffraction (XRD) and differential scanning calorimetry (DSC) And phase transition kinetics, and the activation energy of nanophase transformation was calculated by Arrami’s formula X = 1-exp (-Ktn). The results show that the activation energy required for the formation of α Al13 (Fe, V) 3 Si phase is Al2Fe4 Nd (Al4Fe 0. 9) eV is consistent with the diffusion activation energy of Fe atoms in α Al, indicating that the nucleation and growth of α Al13 (Fe, V) 3 Si phase are mainly controlled by the bulk diffusion of Fe atoms.