Kinetics of cubic to tetragonal transformation under external field by the time-dependent Ginzburg-Landau approach
Kinetics of cubic to tetragonal transformation under external field by the time-dependent Ginzburg-Landau approach
复制标题
通过时间相关的 Ginzburg-Landau 方法在外场下立方体到四方体转变的动力学
DOI：
10.1103/physrevb.62.5435
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发表时间：
2000
影响因子：
3.7
通讯作者：
Y. Yamazaki
中科院分区：
文献类型：
--
作者：
T. Ichitsubo;Katsushi Tanaka;M. Koiwa;Y. Yamazaki
基于含时的Ginzburg-Landau方法，对外场作用下的四畴结构的形成进行了计算机模拟。以$\mathrm{fcc}{\ensuremath{-}L1}_{0}$序为模型，确定了朗道自由能函数，以重现MonteCarlo模拟计算的自由能.模拟结果证实了FePd合金在外加应力作用下实验观察到的特征，并阐明了单一变体结构的形成机制。由外部应力所支持的变体的优先形成所发展的内部应力场进一步协同加速该趋势，并最终导致单一变体结构。
Computer simulations based on the time-dependent Ginzburg-Landau approach have been performed for the formation of domain structure in the cubic-tetragonal transformation under an external field. The $\mathrm{fcc}{\ensuremath{-}L1}_{0}$ ordering has been studied as a model case of the transformation, and the Landau free-energy function has been determined so as to reproduce the free energy calculated by the Monte Carlo simulation. The simulations have demonstrated the features observed in our experiments on FePd alloy under an external stress, and have clarified the formation mechanism of a single variant structure. The internal stress field developed by the preferential formation of a variant favored by the external stress further accelerates the trend cooperatively, and eventually leads to a single variant structure.