快速凝固Al-Fe-V-Si-Nd合金中纳米相转变动力学
来源期刊：中国有色金属学报2000年第4期
论文作者：庞华 邓江宁 张宝金 曾梅光
文章页码：487 - 490
关键词：Al-Fe-V-Si-Nd合金； 快速凝固；相变动力学； 激活能
Key words：Al-Fe-V-Si-Nd alloy;rapid solidification; dynamics of phase transformation； activation energy
摘 要：应用Mossbauer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(- Kt n)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Al8Fe4Nd相向 α -Al13 (Fe,V)3Si相转变, α-Al13 (Fe,V)3Si相生成所需的激活能 E =(2.48±0.09)eV，与Fe原子在 α -Al中的扩散激活能相一致，说明 α-Al13 (Fe,V)3Si 相的形核长大主要由Fe原子的体扩散控制。
Abstract: The dynamics and mechanism of phase transformation in rapidly solidified (RS) Al-Fe-V-Si-Nd nanoalloy were investigated by Mossbauer spectroscopy， DSC and XRD analyses. The results indicated that the metastable phase Al8Fe4Nd transformed to α-Al13 (Fe,V)3Si phase when the alloy was heated. The activation energy E =(2.48±0.09)eV is agree with that of Fe atom diffusion in aluminum. That is to say that Al8Fe4Nd transformation to α-Al13 (Fe,V)3Si phase is controlled by atomic diffusion of Fe atom.
