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arXiv 2203.07150cond-mat.mtrl-scimath.AP
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晶粒长大过程中晶粒体积变化的模拟与实测比较

Comparison of simulated and measured grain volume changes during grain growth

Xiaoyao Peng, Aditi Bhattacharya, S. Kiana Naghibzadeh, David Kinderlehrer, Robert Suter, Kaushik Dayal, Gregory S. Rohrer

摘要:

镍的三维微观结构,观察后五个退火间隔,进行了比较,模拟晶粒生长的阈值动力学方法与假设的毛细作用作为唯一的驱动力。一粒一粒的比较使得有可能确定模拟和实验之间差异的来源。最显著的差异是最小尺寸的颗粒,模拟预测其体积损失和消失的速度比实验中观察到的要快。颗粒的损失产生了剩余颗粒的邻居数量的误差,并且发现模拟颗粒体积的误差与近邻数量的误差相关。虽然各向异性晶界性质可能发挥作用的差异,尺寸依赖的错误表明,它可能是必要的,包括在模型中的尺寸依赖的晶界迁移动力学。

英文摘要:

The three-dimensional microstructure of Ni, observed after five annealing intervals, was compared to simulations of grain growth using the threshold dynamics method with the assumption of capillarity as the only driving force. A grain-by-grain comparison made it possible to identify the sources of differences between the simulation and experiment. The most significant difference was for grains of the smallest sizes, which the simulation predicted would lose volume and disappear at a greater rate than observed in the experiment. The loss of grains created errors in the numbers of neighbors of the remaining grains, and it was found that errors in the simulated grain volume were correlated to errors in the number of near neighbors. While anisotropic grain boundary properties likely play a role in the differences, the size dependence of the errors suggest that it might be necessary to include a size dependence in the model for grain boundary migration kinetics.

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