(东北大学 理学院, 沈阳 110006)
摘 要: 应用Mssbauer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Al4.3Fe 0.7V 1.7Si1.0Nd(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, αAl13 (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 αAl13 (Fe,V)3Si 相的形核长大主要由Fe原子的体扩散控制。
关键字: AlFeVSiNd合金; 快速凝固;相变动力学; 激活能
(College of Sciences, Northeastern University, Shenyang 110006, P.R.China)
Abstract:The dynamics and mechanism of phase transformation in rapidly solidified (RS) AlFeVSiNd nanoalloy were investigated by Mssbauer spectroscopy, DSC and XRD analyses. The results indicated that the metastable phase Al8Fe4Nd transformed to αAl13 (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 αAl13 (Fe,V)3Si phase is controlled by atomic diffusion of Fe atom.
Key words: Al Fe V Si Nd alloy;rapid solidification; dynamics of phase transformation; activation energy