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arXiv 1903.09448cond-mat.mtrl-scicond-mat.dis-nncond-mat.mes-hallphysics.chem-phphysics.comp-ph
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液态金属薄膜结晶过程中晶核的结构和形态

Structure and Morphology of Crystalline Nuclei arising in a Crystallizing Liquid Metallic Film

Bulat N. Galimzyanov, Dinar T. Yarullin, Anatolii V. Mokshin

摘要:

在微观水平上控制结晶过程使得可以生成具有所需结构和形态特性的纳米晶样品,这对现代工业非常重要。在本工作中,我们研究了过冷度对液态金属薄膜中晶核的结构和形态的影响。聚类分析使我们能够计算的衍射图案和评估的形态特征(均匀部分的线性尺寸和表面层的厚度)的晶核出现在系统中在不同水平的过冷。我们发现,液态金属膜在对应于低过冷水平的温度下结晶成单晶,而在深过冷水平下形成多晶结构。我们发现,温度依赖的临界尺寸的晶核包含两个可区分的制度与交叉温度$T/T_{g}\approx1.15$($T_{g}$是玻璃化转变温度),这是由于系统的特定几何形状。

英文摘要:

Control of the crystallization process at the microscopic level makes it possible to generate the nanocrystalline samples with the desired structural and morphological properties, that is of great importance for modern industry. In the present work, we study the influence of supercooling on the structure and morphology of the crystalline nuclei arising and growing within a liquid metallic film. The cluster analysis allows us to compute the diffraction patterns and to evaluate the morphological characteristics (the linear sizes of the homogeneous part and the thickness of the surface layer) of the crystalline nuclei emergent in the system at different levels of supercooling. We find that the liquid metallic film at the temperatures corresponded to low supercooling levels crystallizes into a monocrystal, whereas a polycrystalline structure forms at deep supercooling levels. We find that the temperature dependence of critical size of the crystalline nuclei contains two distinguishable regimes with the crossover temperature $T/T_{g}\approx1.15$ ($T_{g}$ is the glass transition temperature), which appears due to the specific geometry of the system.

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