Effects of anisotropic growth on the deviations from Johnson-Mehl-Avrami kinetics
Effects of anisotropic growth on the deviations from Johnson-Mehl-Avrami kinetics
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各向异性生长对 Johnson-Mehl-Avrami 动力学偏差的影响
DOI：
10.1016/j.actamat.2006.10.022
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发表时间：
2007-03-01
期刊：
影响因子：
9.4
通讯作者：
Yang, Gencang
中科院分区：
文献类型：
--
作者：
Liu, Feng;Yang, Gencang
描述了成核、生长和碰撞对偏离经典Johnson-Mehl-Avrami（JMA）动力学的影响。在等温相变的Monte Carlo（MC）模拟的基础上，进一步研究了由于各向异性生长的影响而导致的偏离JMA动力学的现象。已通过一种分析方法来描述受到各向异性生长的影响相变。结合MC模拟，当在转换期间发生从JMA行为到阻塞行为的转换时，“记忆”时间的效果已经被示出。在此基础上，推导出了一个物理上真实的Avrami指数.对Fe-Mn合金在外加载荷作用下发生的γ-α相变与分析描述进行了比较研究。(c)2006 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The effects of nucleation, growth and impingement on deviations from classical Johnson-Mehl-Avrami (JMA) kinetics are described. On the basis of Monte Carlo (MC) simulations of isothermal phase transformations, the deviations from the JMA kinetics due to the effects of anisotropic growth have been investigated further. An analytical approach has been adopted to describe phase transformations subjected to the effects of anisotropic growth. In combination with MC simulations, the effect of the "memory" time has been shown when the transition from JMA behavior to blocking behavior occurs during the transformation. On this basis, a physically realistic Avrami exponent has been deduced. A comparative study between the analytical description and a gamma-alpha transformation occurring in an Fe-Mn alloy under an applied load has been carried out. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.