The influences of the superheating temperature (T_s) on the nucleation undercooling (ΔT) of metallic melts were investigated by using molecular dynamics simulations based on the embedded atom model (EAM) potential function. The results agree with the intuitive expectation that extremely high heating rates followed by short equilibration time lead to a superheating and partial melting of the solid phase. The fraction of the remained crystalline clusters in the superheated phase depends on the superheating temperature T_s and the equilibration time, as long as T_s is below the maximal superheating. A subsequent fast cooling facilitates a substantial undercooling of the molten phase. The achieved undercooling ∆T below the steady-state melting temperature T_m depends on the size and the concentration of the crystalline clusters remained in the liquid phase, and thus on the initial superheating temperature T_s. Based on the simulated results, a model was proposed for describing the relationship of ΔT and T_s, with which simulated data are well fitted and the maximal undercooling for metals can be predicted.

中文翻译：

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过热度对金属熔体形核过冷的影响

过热温度（的影响Ť_小号）上成核过冷度（Δ Ť）金属熔体的通过使用分子动力学模拟基于嵌入式原子模型（EAM）势函数的影响。结果与直觉预期一致，即极高的加热速率和短的平衡时间会导致固相过热和部分熔化。过热相中剩余晶簇的比例取决于过热温度T _s和平衡时间，只要T _s低于最大过热度。随后的快速冷却有利于熔融相的显着过冷。达到低于稳态熔化温度T _{m 的过}冷度 ∆ T取决于保留在液相中的晶簇的大小和浓度，因此取决于初始过热温度T _s。根据模拟的结果，一个模型提出了用于描述Δ的关系Ť和Ť_小号，利用该模拟数据是公嵌合的最大过冷对金属可以预测的。