多晶材料均相和非均相熔化动力学的耦合
Coupling of homogeneous and heterogeneous melting kinetics in polycrystalline materials
摘要：
基于一个明确耦合均相和非均相熔化机制的新模型，分析了多晶材料的熔化动力学。这种方法的显着特点在于它的能力，不仅评估粒度分布的影响，对整体熔化动力学，但也两个熔化机制之间的竞争。我们首次揭示了多晶材料熔化的温度-时间-转变图的三部分结构，通过它可以确定主导熔化机制切换的临界温度。临界温度随平均晶粒直径的减小而增大，并遵循负幂律。结果与实验观察定性一致。
英文摘要：
Melting kinetics of polycrystalline materials is analyzed on the basis of a new model which explicitly couples homogeneous and heterogeneous melting mechanisms. The distinct feature of this approach lies in its ability to evaluate not only grain-size-distribution effects on the overall melting kinetics but also competitions between the two melting mechanisms. For the first time, we reveal the three-part structure of temperature-time-transformation diagrams for melting of polycrystalline materials, through which it is possible to determine a critical temperature across which the dominant melting mechanism switches. The critical temperature increases as the mean-grain-diameter decreases following a negative power-law. The results are qualitatively consistent with experimental observations.
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