Spinodal分解过程中的非晶化前驱体
Amorphous Precursors of Crystallization during Spinodal Decomposition
摘要：
本文采用广义朗道自由能泛函研究了液-固Spinodal分解过程中的结晶动力学。在SD的早期阶段施加的强长度尺度选择性诱导的外观与二十面体顺序结晶的小前体。这些前体通过添加新的粒子以密集的四面体簇生长。随着无定形核的平均尺寸变得足够大以减少几何挫折，具有体心立方对称（bcc）的结晶颗粒在生长的簇上非均匀地成核。结晶相的体积分数强烈地依赖于淬火的深度。在深度猝灭时，SD机制产生排列在致密多四面体聚集体中的无定形结构。
英文摘要：
A general Landau's free energy functional is used to study the dynamics of crystallization during liquid-solid Spinodal Decomposition (SD). The strong length scale selectivity imposed during the early stage of SD induces the appearance of small precursors for crystallization with icosahedral order. These precursors grow in densely packed clusters of tetrahedra through the addition of new particles. As the average size of the amorphous nuclei becomes large enough to reduce geometric frustration, crystalline particles with a body center cubic symmetry (bcc) heterogeneously nucleates on the growing clusters. The volume fraction of the crystalline phase is strongly dependant on the depth of quench. At deep quenches, the SD mechanism produces amorphous structures arranged in dense polytetrahedral aggregates.
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