Length scales in phase coarsening: Theory, simulation, and experiment
Length scales in phase coarsening: Theory, simulation, and experiment
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相位粗化中的长度尺度：理论、模拟和实验
DOI：
10.1016/j.commatsci.2004.11.005
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发表时间：
2005
影响因子：
3.3
通讯作者：
K. Rajan
中科院分区：
文献类型：
--
作者：
K. G. Wang;M. Glicksman;K. Rajan
分散在整个连续基质中的球形沉淀物群体内发生的集体相互作用可以基于扩散屏蔽长度来描述。这个临界长度尺度是从球形沉淀物扩散限制相粗化的准静态理论推导出来的。该理论预测作为分散体体积分数的函数的扩散屏蔽长度的变化，最大粒径，人口的粗化率，最后，仿射粒径分布。此外，通过考虑观察到的波动中的单个粒子的生长速率，我们制定了随机理论相粗化。用多粒子扩散方法和相场模型模拟相粗化得到的结果与动力学理论进行了比较。最后，通过对二元Al-Li合金中δ′（Al 3Li）析出相的测量，验证了理论和模拟预测的颗粒尺寸分布和最大半径与实验结果的一致性.
The collective interactions occurring within a population of spherical precipitates dispersed throughout a contiguous matrix may be described on the basis of a diffusion screening length. This critical length scale is derived from the quasi-static theory of diffusion-limited phase coarsening of spherical precipitates. This theory predicts as functions of the dispersoid volume fraction the changes in diffusion screening length, the maximum particle size, the population’s coarsening rate, and, finally, the affine particle-size distribution. Furthermore, by considering fluctuations observed in the growth rates of individual particles, we formulate a stochastic theory of phase coarsening. Results obtained from simulating phase coarsening using multiparticle diffusion approaches and phase field model are then compared to the kinetic theories. Finally, particle-size distributions and the maximum radii predicted from theory and simulations are shown to agree well with experimental results obtained from measurements performed on δ′ (Al3Li) precipitates in binary Al–Li alloys.