Kinetics of irradiation-induced phase transformations in tricritical systems.
Kinetics of irradiation-induced phase transformations in tricritical systems.
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三临界系统中辐照诱导相变的动力学。
DOI：
10.1103/physrevb.54.6184
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Abromeit
中科院分区：
文献类型：
--
作者：
Matsumura;Müller;Abromeit
讨论了高能粒子辐照下合金成分{italX}（{italr}，{italt}）和长程有序度{italS}（{italr}，{italt}）的局部变化随时间的演化。考虑到辐射诱导的原子混合和无序以及辐射增强的扩散和有序，推导了含时Ginzburg-Landau形式的{ital X}和{ital S}的耦合动力学方程。首先，在适当的辐照条件下，我们得到了定态的模型相图。它示出了如何的有序相场和有序和无序相之间的兼容性间隙依赖于照射条件。接下来，我们展示了从（有序+无序）的两相混合物到单相状态的溶解过程的模拟的一些例子。在较低的温度下，有序相首先被无序化，然后组成调制通过溶解而消失。相反，无序化和溶解在较高温度下同时进行。美国物理学会（American Physical Society）
We discuss the time evolution of local changes in the alloy composition {ital X}({ital r},{ital t}) and in the degree of long-range order {ital S}({ital r},{ital t}) under irradiation with energetic particles. Coupled kinetic equations for {ital X} and {ital S} are derived in the time-dependent Ginzburg-Landau forms, taking into account the irradiation-induced atomic mixing and disordering as well as the irradiation-enhanced diffusion and ordering. At first, we obtain the model phase diagrams of stationary states under appropriate conditions of irradiation. It is shown how the ordering phase field and the miscibility gap between ordered and disordered phases depend on the irradiation conditions. Next, we demonstrate some examples of the simulation of the dissolution process from the two-phase mixture of (order+disorder) into a single-phase state. At a relatively low temperature, the ordered phase is first disordered and then the composition modulation disappears by dissolution. In contrast, the disordering and the dissolution proceed simultaneously at higher temperatures. {copyright} {ital 1996 The American Physical Society.}