Deduction of activation energy for diffusion by analyzing soft impingement in isothermal solid-state precipitation

Fan, Kai; Liu, F.; Song, Shaojie; Gao, Yang; Zhou, Yaohe

doi:10.1016/j.jallcom.2009.10.181

Cited by 4 publications

(2 citation statements)

References 26 publications

(43 reference statements)

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“…As a typical nucleation/growth controlled process, the precipitation is well known as the formation of new-phase particles from supersaturated solid solution [8][9][10]. So far, our recent theoretical works about the precipitation kinetics were mainly focused on the soft impingement model [11][12][13][14][15]. In view of the previous works, it must be noted that, any precipitation from the supersaturated solid solution is connected with the solute distribution, which inevitably refers to the initial condition of the matrix phase [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution in Undercooled Ni-Si Melt

Fan

Liu

et al. 2013

MSF

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Upon non-equilibrium solidification, the intrinsic parameters, such as moving velocity, temperature, solute partition coefficient, and liquid and solid concentrations at the interface, deviate from their equilibrium characteristics, and the morphology of the as-solidified structure and the grain size are influenced by the non-equilibrium liqulid/solid transformation, which further influences the subquent solidstate transformation. Adopting molten glass purification technology combined with cycle superheating method, the microstructure evolution of Ni-11at.%Si alloy in different undercooling was investigated. It was found that, with the increase of the initial undercooling, grain refinement occurred in microstructures of undercooled Ni-11at.%Si alloy. Meanwhile, the NL model was used to discuss the two different dendrite morphologies. According to Karmas model for dendrite fragmentation, the grain refinement of undercooled Ni-11at.%Si alloy was in good agreement with the experimental data, and the grain size was reduced with the increasing ΔT. The energy-dispersive spectroscopy (EDS) measurement was applied to analyze the solid solubility of Si atom in α-Ni matrix. It was found that the solid solubility of Si atom in α-Ni matrix increased with undercooling. At the undercooling of T>220K , a complete solute trapping occurred.

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Section: Introductionmentioning

confidence: 99%

Microstructure Evolution in Undercooled Ni-Si Melt

Fan

Liu

et al. 2013

MSF

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“…Deep understanding of the nucleation and growth kinetics of precipitates can improve the mechanical properties and optimize the process control, and therefore acquire suitable capabilities of products [3]. So far, our theoretical works about the precipitation kinetics were mainly focused on the soft impingement model [7][8][9][10]. In view of the previous works, it must be noted that, any precipitation from the supersaturated solid solution is connected with the solute distribution, which inevitably refers to the initial condition of the matrix phase [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Calorimetric Analysis of Precipitation in Undercooled Ni-Si Alloy

Fan

Liu

et al. 2013

AMM

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In order to study the precipitaion of Ni3Si particle in undercooled Ni-Si alloy, calorimetric analyses were carried out using non-isothermal measurements by DSC. The scanning electron microscopy (SEM) and the transmission electron microscopy (TEM) measurements were used to describe qualitatively and quantitatively the precipitate microstructures. The non-isothermal DSC thermograms exhibited one reaction peaks and it indicated that the precipitation process is an exothermic reaction. The evolution for the precipitate was obtained in the as-solidified Ni-Si alloy subjected to DT=195K, meanwhile, the precipitate size was found increased with decreased heating rate in the TEM images. The largest precipitate size was about 120nm, and the precipitates still kept spherical shape. Model prediction for the precipitation of Ni3Si particle has been performed. Good agreement with experimental data has been achieved

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