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A mean-field model for amorphization in crystalline solid solutions

机译：结晶固溶体中非晶化的平均场模型

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摘要

Based on our understanding of the atomic mechanisms of melting in binary crystalline solid solutions, we propose a unified two-order-parameter mean-field model to describe solid-state amorphization under polymorphic constraints. In this framework, we treat both thermal melting and amorphization on equal footing as a topological-order-to-disorder transition. The primary order parameter is defined such that it represents the loss of the long-range order. The elastic strain field induced by composition disorder that plays an important role at low temperature is described by a bilinear coupling with the primary order parameter. We show that solid-state amorphization can be considered as an extension of a melting transition at low temperature under polymorphic constraints. This theory can also address endothermic melting as well as exothermic melting at low temperature. We present phase diagrams and the corresponding thermodynamic quantities for a model binary crystalline solution system at and near the transitions.
机译：基于对二元晶体固溶体熔化的原子机理的理解，我们提出了一个统一的二参数平均场模型来描述多态约束下的固态非晶化。在此框架中，我们将热熔和非晶态化在相等的基础上视为拓扑顺序到无序的过渡。定义主要订单参数，使其代表远程订单的损失。由成分紊乱引起的弹性应变场在低温下起重要作用，它是通过与一次参数的双线性耦合来描述的。我们表明，固态非晶化可被视为在多态性约束下在低温下熔融转变的扩展。该理论还可以解决吸热熔化以及低温下的放热熔化问题。我们在相变处及其附近给出了模型二元结晶溶液系统的相图和相应的热力学量。

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  • 来源
    《Journal of Applied Physics》 |2011年第10期|p.320-329|共10页
  • 作者

    Huaming Li; Mo Li;

  • 作者单位

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA,School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA;

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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