School of Mechanical Engineering, Southwest Petroleum University, Chengdu, China.
Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing, China.
PLoS One. 2020 Mar 10;15(3):e0230028. doi: 10.1371/journal.pone.0230028. eCollection 2020.
The heterogeneous melting kinetics of polycrystalline aluminum is investigated by a theoretical model which represents the overall melting rate as a functional of the Weibull grain-size-distribution. It is found that the melting process is strongly affected by the mean-grain-diameter, but is insensitive to the shape parameter of the Weibull distribution. The temperature-time-transformation (TTT) diagrams are calculated to probe dependence of the characteristic timescale of melting on the overheating temperature and the mean-grain-diameter. The model predicts that the heterogeneous melting time of polycrystalline aluminum exponentially depends on temperature in high temperature range and the exponent constant is an intrinsic material constant independent of the mean-grain-diameter. Comparisons between TTT diagrams of heterogeneous melting and homogenous melting are also provided.
多晶铝的非均匀熔化动力学通过一个理论模型进行研究，该模型将整体熔化速率表示为威布尔晶粒尺寸分布的函数。研究发现，熔化过程强烈受到平均晶粒直径的影响，但对威布尔分布的形状参数不敏感。通过计算温度-时间转变（TTT）图来研究熔化特征时间对过热度和平均晶粒直径的依赖性。该模型预测，多晶铝的非均匀熔化时间在高温范围内与温度呈指数关系，指数常数是一个与平均晶粒直径无关的固有材料常数。还提供了非均匀熔化和均匀熔化的 TTT 图的比较。
