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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >A method based on the centroid of segregation points: A Voronoi polygon application to solidification of alloys
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A method based on the centroid of segregation points: A Voronoi polygon application to solidification of alloys

机译：基于偏析点的质心的方法：Voronoi多边形应用于合金凝固

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A new method for controlling segregation delicately based on the centroid of independent segregation points in an alloy macrostructure is established using Voronoi polygon method. Voronoi polygon area is found to nearly obey the log-normal distribution, which shows that a polygon may reflect a new solidifying unit. The relationship between Voronoi polygon characteristics and carbon segregation extent (segregation ratio) is investigated at different locations. In a pure columnar grain zone, the segregation extent worsens as the Voronoi polygon size decreases; in an equiaxed grain zone, this extent worsens as the size increases. A near-equilibrium solidification model for polygons under different conditions is studied, and the results are consistent with the aforementioned finding of segregation ratio. Compared with a secondary arm spacing, the fractal dimension of the solidification structure may be a better method to describe the characteristics of the solidification structure and the size change of Voronoi polygons as to relevant segregation. Thus, this study proposes a new experimental method that depicts the macrostructure from a different perspective, i.e., the segregation point instead of the solidification structure. The formation of Voronoi polygons created by segregation points during solidifying should be divided into two stages, i.e., appearance of the segregation point and determination of the polygon's outline. The segregation extent can be controlled by altering the size of the relevant Voronoi polygon, which is a unique alternative strategy for improving the uniformity of element distribution rather than simultaneously considering nucleus formation, solidification structure growth, and liquid flow as to the complex process of segregation formation. (C) 2018 Elsevier B.V. All rights reserved.
机译：用于控制偏析的新方法微妙基于独立偏析点在合金宏观结构的质心是使用Voronoi多边形法建立。 Voronoi多边形区域被发现几乎服从对数正态分布，其示出了多边形可以反映新的固化装置。 Voronoi多边形特性和碳偏析程度（偏析比）之间的关系在不同的位置进行了研究。在纯柱状晶粒区，偏析程度恶化为Voronoi多边形尺寸减小;在等轴晶区，此程度上恶化随着尺寸增加而增加。在不同条件下的多边形的近平衡凝固模型进行了研究，其结果是与分离比上述发现一致。与辅助臂间距相比，凝固结构的分形维数可能是更好的方法来描述凝固组织和的Voronoi多边形的尺寸变化，以相关的偏析的特性。因此，本研究提出，描绘了来自不同的角度的宏观结构新的实验方法，即，偏析点而不是凝固组织。凝固时偏析点创建的Voronoi多边形的形成应分为两个阶段，即，偏析点的外观和确定多边形的轮廓的。偏析程度可以通过改变相关的Voronoi多边形，这是用于提高元素分布的均匀性，而不是一个独特的替代策略的尺寸来控制同时考虑核形成，凝固组织的生长，并为隔离的复杂过程液流形成。 （c）2018年elestvier b.v.保留所有权利。

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