(東北大學 理學院, 沈陽 110006)
摘 要: 應用Mssbauer譜, X射線衍射(XRD)和差式掃描量熱法(DSC)研究了顆粒彌散的快速凝固Al4.3Fe 0.7V 1.7Si1.0Nd(摩爾分數(shù), %)合金中納米相的轉(zhuǎn)變和相變動力學,并用Arrami公式 X =1-exp(- Kt n)計算了納米相轉(zhuǎn)變的激活能。 結(jié)果表明: 快速凝固納米合金在加熱過程中發(fā)生Al8Fe4Nd相向 α Al13 (Fe,V)3Si相轉(zhuǎn)變, αAl13 (Fe,V)3Si相生成所需的激活能 E =(2.48±0.09)eV,與Fe原子在 α Al中的擴散激活能相一致,說明 αAl13 (Fe,V)3Si 相的形核長大主要由Fe原子的體擴散控制。
關(guān)鍵字: AlFeVSiNd合金; 快速凝固;相變動力學; 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


