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首页> 外文会议>The 5th International Conference on Physical and Numerical Simulation of Materials Processing: Abstracts Program >Microstructure Simulation of Al alloy with a Modified Cellular Automaton Method
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Microstructure Simulation of Al alloy with a Modified Cellular Automaton Method

机译：改进元胞自动机法模拟铝合金组织

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摘要

A stochastic model for simulating the microstructure formation of Al－4.5Cu alloy during solidification has been developed, based on the finite element method(FEM) for macroscopic model of heat transfer calculation and a modified Cellular Automaton (mCA) for microscopic modeling of nucleation, growth of crystal. In this model, the effect of solute redistribution, interface curvature and preferred orientation was considered. A new probabilistic neighborhood configuration was adopted to neglect the influence of continuous nucleation. A numerical simulation was developed with C++. The computation was carried out to understand the effect of nucleation parameters on the microstructure formation, and then displayed on screen. The mould can simulate the formation of the microstructure of columnar grain, equiaxed grain and the transformation process from columnar to equiaxed grain (CET). The effects of ΔTv,ma and nv on the microstructure. The degree of undercooling (ΔTv,ma) determines the columnar, CET and equiaxed solidification. The value of nucleation density (nv) also has a significant effect on the equiaxed grain size. Low nucleation of undercooling with large maximum nucleation site number leads to a fine and fully equiaxed microstructure. Increased heat transfer coefficient gives fine grains which are more equiaxed. The program which developed by ourselves has the advantage fast and accurate in evaluation of solidification microstructure.
机译：基于有限元方法（FEM）用于传热计算的宏观模型，并基于改进的元胞自动机（mCA）用于成核的微观模型，建立了一个模拟Al－4.5Cu合金凝固过程中微观组织形成的随机模型，晶体的生长。在该模型中，考虑了溶质的重新分布，界面曲率和首选取向的影响。采用了一种新的概率邻域配置来忽略连续成核的影响。用C ++开发了数值模拟。进行计算以了解成核参数对微结构形成的影响，然后显示在屏幕上。该模具可以模拟圆柱状晶粒，等轴晶粒的形成以及从圆柱状晶粒向等轴晶粒（CET）的转变过程。 ΔTv，ma和nv对微观结构的影响。过冷度（ΔTv，ma）决定了柱状，CET和等轴凝固。成核密度（nv）的值也对等轴晶粒度有重要影响。具有最大最大成核位点数的过冷度低的成核会导致精细且完全等轴的显微组织。增加的传热系数可得到更等轴的细晶粒。由我们自己开发的程序在评估凝固组织方面具有快速而准确的优势。

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