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arXiv 0802.2529cond-mat.mtrl-scicond-mat.stat-mech
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Al50Ni50晶体生长和熔化的分子动力学计算机模拟

Molecular Dynamics Computer Simulation of Crystal Growth and Melting in Al50Ni50

Ali Kerrache, Juergen Horbach, Kurt Binder

摘要:

采用分子动力学方法模拟了Al 50 Ni 50的熔化和晶化过程,采用嵌入原子型势模拟颗粒间的相互作用。模拟板状几何结构中的系统,其中在细长模拟箱中间的AlNi的B2相通过两个平面界面与液相分离,从而考虑(100)晶体取向。通过确定界面速度的温度依赖性,提供熔化温度的准确估计。动力学增长系数k= 0.0025m/s/K,比最近单组分金属模拟研究中的结果小两个数量级。经典的Wilson-Frenkel模型不能定量描述晶体生长动力学。我们认为,这是由于忽略了扩散过程中的液晶界面。

英文摘要:

The melting and crystallization of Al50Ni50} are studied by means of molecular dynamics computer simulations, using a potential of the embedded atom type to model the interactions between the particles. Systems in a slab geometry are simulated where the B2 phase of AlNi in the middle of an elongated simulation box is separated by two planar interfaces from the liquid phase, thereby considering the (100) crystal orientation. By determining the temperature dependence of the interface velocity, an accurate estimate of the melting temperature is provided. The value k=0.0025 m/s/K for the kinetic growth coefficient is found. This value is about two orders of magnitude smaller than that found in recent simulation studies of one-component metals. The classical Wilson-Frenkel model is not able to describe the crystal growth kinetics on a quantitative level. We argue that this is due to the neglect of diffusion processes in the liquid-crystal interface.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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