纳米W粉冲击烧结的分子动力学模拟

刘晓雯 冯建锐 周强 陈鹏万

刘晓雯, 冯建锐, 周强, 陈鹏万. 纳米W粉冲击烧结的分子动力学模拟[J]. 爆炸与冲击, 2020, 40(2): 024202. doi: 10.11883/bzycj-2019-0057
引用本文: 刘晓雯, 冯建锐, 周强, 陈鹏万. 纳米W粉冲击烧结的分子动力学模拟[J]. 爆炸与冲击, 2020, 40(2): 024202. doi: 10.11883/bzycj-2019-0057
LIU Xiaowen, FENG Jianrui, ZHOU Qiang, CHEN Pengwan. Molecular dynamics simulation of shock consolidation of nano tungsten powder[J]. Explosion And Shock Waves, 2020, 40(2): 024202. doi: 10.11883/bzycj-2019-0057
Citation: LIU Xiaowen, FENG Jianrui, ZHOU Qiang, CHEN Pengwan. Molecular dynamics simulation of shock consolidation of nano tungsten powder[J]. Explosion And Shock Waves, 2020, 40(2): 024202. doi: 10.11883/bzycj-2019-0057

纳米W粉冲击烧结的分子动力学模拟

doi: 10.11883/bzycj-2019-0057
详细信息
    作者简介:

    刘晓雯(1993- ),女,硕士研究生,m13419519852@163.com

    通讯作者:

    陈鹏万(1971- ),男,博士,教授,pwchen@bit.edu.cn

  • 中图分类号: O383

Molecular dynamics simulation of shock consolidation of nano tungsten powder

  • 摘要: 粉末冲击烧结是制备高品质W的一种有效方法,而分子动力学方法在尺度极小、过程迅速的数值模拟上有着独特的优势。因此运用分子动力学方法,结合W的嵌入原子势,对常温下的纳米W粉末的冲击烧结过程进行模拟,得到颗粒微观压实过程图、体系速度分布云图、p-UpT-UpT-p曲线以及径向分布函数。研究了不同颗粒速度及产生的射流对纳米W粉末冲击烧结影响,分析了微观冲击烧结机理。结果表明,低速冲击条件下(500 m/s以下),纳米颗粒无法压实。高速条件下(1 000 m/s及以上),颗粒能获得致密化很高的压实。颗粒间的相互挤压造成的高应力使颗粒表面的原子发生流动变形,原子向颗粒间空隙流动,形成压实。颗粒间产生的射流以及高速冲击导致的颗粒熔化,均促进烧结获得致密度更高的烧结体。
  • 图  1  图名模型示意图

    Figure  1.  Model illustration

    图  2  压实形貌图

    Figure  2.  Compacted topography

    图  3  1 000 m/s颗粒速度下的冲击压实过程

    Figure  3.  Impact compaction process at 1 000 m/s particle velocity

    图  4  不同的速度下的原子径向分布函数

    Figure  4.  Radial distribution functions at different velocities

    图  5  温度-速度关系

    Figure  5.  Relationship between temperature and particle velocity

    图  6  压力-速度关系

    Figure  6.  Relationship between pressure and particle velocity

    图  7  温度-压力关系

    Figure  7.  Relationship between temperature and pressure

    图  8  不同颗粒速度下体系的速度分布

    Figure  8.  Velocity distribution of the system at different particle velocities

    图  9  模型2压实形貌图

    Figure  9.  Compaction topograph of model 2

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出版历程
  • 收稿日期:  2019-02-27
  • 修回日期:  2019-04-04
  • 网络出版日期:  2020-01-15
  • 刊出日期:  2020-02-01

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