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arXiv 0705.1737cond-mat.mtrl-sci
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熔化钨纳米颗粒的分子动力学研究

Melting tungsten nanoparticles: a molecular dynamics study

Amitava Moitra, Sungho Kim, J. Houze, B. Jelinek, Seong-Jin Park, Randall M. German, M. F. Horstemeyer, Seong-Gon Kim

摘要:

采用分子动力学模拟研究了钨(W)纳米颗粒的熔化过程。采用改进的嵌入原子法(MEAM)原子间相互作用势描述钨原子间的相互作用。发现不同尺寸的无支撑钨纳米颗粒的熔化温度随着颗粒尺寸的减小而降低。在本研究中获得的熔化温度近似是半径的倒数的递减函数,在一个很好的协议与热力学模型的预测。我们还观察到,W纳米粒子的熔化之前,其外皮在低于其熔化温度的温度下预熔化。

英文摘要:

We report a molecular dynamics simulation of melting of tungsten (W) nanoparticles. The modified embedded atom method (MEAM) interatomic potentials are used to describe the interaction between tungsten atoms. The melting temperature of unsupported tungsten nanoparticles of different sizes are found to decrease as the size of the particles decreases. The melting temperature obtained in the present study is approximately a decreasing function of inverse radius, in a good agreement with the predictions of thermodynamic models. We also observed that the melting of a W nanoparticle is preceded by the premelting of its outer skin at a temperature lower than its melting temperature.

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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