Analysis of grain growth process in melt spun Fe–B alloys under the initial saturated grain boundary segregation condition

Chen, Z.; Liu, F.; Yang, Xiaoqin; Fan, Yu; Shen, C.J.

doi:10.1016/j.jallcom.2011.08.051

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…Therefore, the growth kinetics of Bi shell is obstructed during the shell thickening via volume diffusion, and the Bi diffusion will reach a saturation level ultimately. [ 41 ] In this case, Δ H can be regulated by

\begin{array}{*{20}{c}}{\Delta H = \Delta {E_S} - \Delta {E_U} + \Delta {E_l}}\end{array}

where Δ E S is the intrinsic activation energy for Bi self‐diffusion in AgBi, determined by the structure and element content of np‐AgBi core, Δ E U is energy term corresponding to the applied potential ( U ), and Δ E l is the increment of activation energy that holds a linear relation with l . The influence of Δ E U and Δ E l on volume diffusion is schematically illustrated in Figure 3d, indicating their effects on activation energies.…”

Section: Resultsmentioning

confidence: 99%

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Potential Driven Volume Diffusion in Nanoporous AgBi at Room Temperature

Zhou

Qian

et al. 2023

Adv Funct Materials

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Volume diffusion is crucial for crystal growth and interface manipulation in electron devices and catalysts. Its kinetics only becomes vigorous at high temperature, in which case grain boundary diffusion and surface diffusion dominate usually. In this study, volume diffusion of Bi atoms in nanoporous AgBi can be driven by electrochemical potential at room temperature due to ligament expansion. Bi diffusion induces conformal covering of amorphous Bi2O3 shell onto the spatially interconnected skeletons without ligament coarsening. Growth kinetics of amorphous shell demonstrates that the potential dependence of Bi volume diffusion activation energy corresponds to 0.932 eV V−1. Compared with temperature dependence, potential supply is confirmed to be more feasible to modulate volume diffusion rate and shell thickness, and Bi enrichment increases 3.4 times when potential raises from −0.85 to −1.05 V. Potential driven volume diffusion at room temperature reported here knobs one door to manipulate local composition of functional nanostructures and nano‐devices at atomic scale.

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\begin{array}{*{20}{c}}{\Delta H = \Delta {E_S} - \Delta {E_U} + \Delta {E_l}}\end{array}

Section: Resultsmentioning

confidence: 99%

Section: Observation and Mechanism Of Potential Driven Bi Diffusionmentioning

confidence: 99%

Potential Driven Volume Diffusion in Nanoporous AgBi at Room Temperature

Zhou

Qian

et al. 2023

Adv Funct Materials

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“…36,[42][43][44][45] Correspondingly, a theoretical model named "thermo-kinetic correlation" is proposed to describe the physics of the thermo-kinetic stabilization. 42 Within the thermo-kinetic framework, several investigations that are different from traditionally pure thermodynamic and pure kinetic stabilizations, have been carried out, [36][37][38][42][43][44][45][46][47][48][49][50] from which new insights in understanding the stabilizing mechanisms of NC materials have been found.…”

Section: Introductionmentioning

confidence: 99%

Review of thermo‐kinetic correlation during grain growth in nanocrystalline materials

Peng

Jian

Liu

2020

Int J Ceramic Engine & Sci

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Nanocrystalline (NC) materials exhibit many unique properties over their coarse‐grained counterparts due to the high grain boundary density and the small grain size, but they are too difficult to be used in engineering environment because of the poor thermal stability. With regard of this, two strategies are previously proposed to enhance the thermal stability (or impede the grain growth) of NC materials, that is, the thermodynamic and the kinetic approaches. Recent investigations increasingly support that the two approaches may be physically interacted and acted on each other, and they can be treated together within a unified thermo‐kinetic framework. This paper reviews the progress in the investigation of thermo‐kinetic correlation during grain growth in NC materials. First, the theoretical models to describe the concept of the thermo‐kinetic correlation and the grain growth equations developed based on the thermo‐kinetic correlation are reviewed. Second, experimental and simulated evidences to support the coexistence of thermodynamic and kinetic effects are summarized. Third, the potential application of thermo‐kinetic correlation is analyzed and discussed. This paper shows that the stabilization of NC materials can be tailored by the selection of the suitable strategies. Finally, several directions that require further exploration are identified.

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“…The exceptional thermal stability with regard to grain growth has been interpreted by several groups in terms of a reduced or even zero GB energy as a consequence of excess solute at the boundaries [21][22][23]. Considering the interrelated effect of kinetics and thermodynamics, a thermo-kinetic model was derived based on the initial GB segregated condition to describe the present process [21], Therefore, T and t were considered as the highest temperature of recalescence, T R and post-recalescence time, t p, respectively. Combining the parameters in Table 1, grain size D of the recrystallized Ni-Sn alloy as a function of dimensionless post-recalescence time (i.e.…”

Section: Grain Growth Solute Segregation and Thermal Stabilitymentioning

confidence: 99%