纳米Al2O3颗粒对纯Fe液诱导凝固过程的分子动力学模拟

doi:10.3866/PKU.WHXB201203301

物理化学学报 >> 2012, Vol. 28 >> Issue (06): 1347-1354.doi: 10.3866/PKU.WHXB201203301

纳米Al₂O₃颗粒对纯Fe液诱导凝固过程的分子动力学模拟

赖莉珊, 吴永全, 沈通, 张宁, 高帅

上海大学上海市现代冶金及材料制备重点实验室, 上海 200072

收稿日期:2011-12-01 修回日期:2012-03-21 发布日期:2012-05-17
通讯作者: 吴永全 E-mail:yqwu@staff.shu.edu.cn
基金资助:
国家自然科学基金(50974083, 51174131), 国家自然科学基金钢铁联合基金(50774112), 上海市青年科技启明星计划(07QA4021)和上海市教育委员会科研创新计划(09YZ24)资助项目

Molecular Dynamics Simulation of Induced Solidification Process of Pure Liquid Fe by Al₂O₃ Nanoparticles

LAI Li-Shan, WU Yong-Quan, SHEN Tong, ZHANG Ning, GAO Shuai

Shanghai Key Laboratory of Modern Metallurgy & Materials Processing, Shanghai University, Shanghai 200072, P. R. China

Received:2011-12-01 Revised:2012-03-21 Published:2012-05-17
Contact: WU Yong-Quan E-mail:yqwu@staff.shu.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (NSFC) (50974083, 51174131), Joint Funds of NSFC-Steel, China (50774112), Shanghai“Phosphor”Science Foundation, China (07QA4021), and Creative Scientific Research Foundation of Education Commission of Shanghai, China (09YZ24).

摘要/Abstract

摘要： 采用分子动力学(MD)方法模拟了不同半径大小的纳米Al₂O₃颗粒夹杂在三个温度下(1750、1730 和1710 K)对纯Fe液的诱导凝固过程, 并分析了作为诱导核心的纳米Al₂O₃颗粒的结构演变及其对Fe原子体系的凝固过程的影响. 发现在诱导过程中, 纳米Al₂O₃颗粒的内部保持较好的晶型结构, 仅表面原子有结构变形; 诱导凝固的Fe原子主要为面心立方(fcc)和密排六方(hcp)原子; 纳米Al₂O₃颗粒的尺寸越大, 发生诱导凝固的温度越高; 诱导凝固得到的Fe晶体的晶格取向受纳米Al₂O₃颗粒在Fe液中的漂移程度影响.

关键词: 诱导凝固, 纳米Al₂O₃颗粒, 纯Fe液, 分子动力学模拟

Abstract: The molecular dynamics (MD) method has been used to simulate the solidification process of pure liquid Fe induced by a series of Al₂O₃ nanoparticles of different radii at three temperatures (1750, 1730 and 1710 K). The structural evolution of Al₂O₃ nanoparticles and the effect of these particles on the solidification process of pure Fe have been analyzed. It was found that during the solidification process, the inner structure of the Al₂O₃ nanoparticles remained crystalline and structural deformation only occurred in surface atoms. The CTIM-2 method showed that the solidified Fe atoms were mainly faced-centered cubic (fcc) and hexagonal closed-packed (hcp) atoms. In addition, the temperature at which solidification took place was influenced by the size of the Al₂O₃ nanoparticles. The orientations of the resulting Fe crystals were influenced by the extent of the drift of the Al₂O₃ nanoparticles.

Key words: Induced solidification, Al2O3 nanoparticle, Pure liquid Fe, Molecular dynamics simulation

MSC2000:

O641

赖莉珊, 吴永全, 沈通, 张宁, 高帅. 纳米Al₂O₃颗粒对纯Fe液诱导凝固过程的分子动力学模拟[J]. 物理化学学报, 2012, 28(06): 1347-1354.

LAI Li-Shan, WU Yong-Quan, SHEN Tong, ZHANG Ning, GAO Shuai. Molecular Dynamics Simulation of Induced Solidification Process of Pure Liquid Fe by Al₂O₃ Nanoparticles[J]. Acta Phys. -Chim. Sin., 2012, 28(06): 1347-1354.

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纳米Al₂O₃颗粒对纯Fe液诱导凝固过程的分子动力学模拟

Molecular Dynamics Simulation of Induced Solidification Process of Pure Liquid Fe by Al₂O₃ Nanoparticles

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