晶粒拓扑学的实验和仿真研究

Experimental and Simulation Study on Grain Topology

摘要:

采用系列截面法获取了纯铁晶粒组织的拓扑学数据，同时结合正常晶粒长大的Monte Carlo仿真，对三维晶粒拓扑学进行了研究。结果表明：纯铁的平均晶粒面数=12.46，有别于其他金属（如β-Ti合金、Al-Sn合金、β-黄铜、低碳钢等）；实验数据值之间的差异（=11.16~13.93），表明不同材料中的不同界面能和晶界迁移率对多晶组织演变过程具有重要影响；在晶粒面数分布和尺寸分布方面，Monte Carlo仿真数据与纯铁数据相一致，与文献中Al98Sn2合金的数据有明显差异，表明晶界析出物（Sn原子在Al98Sn2晶界析出）对晶粒尺寸分布和面数分布有一定影响。

Abstract:

The grain topology was investigated by the topological data from serial sectioning experiment on pure iron and simulation of grain growth with Monte Carlo method. The results show that the mean number of faces of pure iron =12.46 is different from other experimental data in literatures, such as β-brass, Al-Sn alloy, β-titanium, austenite grains of steel, etc. The reason is likely due to the variable surface tension and mobility, which are assumed to play an important role in the evolution of polycrystalline grain systems and thus exert influence on the topological characteristics of the grain network. For the distribution of the number of faces per grain and the grain size distribution, the data from Monte Carlo simulation is consistent with the data from pure iron, but different with the data from Al98Sn2 due to the segregation of Sn atoms to the grain boundary that possibly alter the grain growth process.