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首页> 外文期刊>Journal of Applied Physics >Spalling fracture of Ni/Al nanolaminates influenced by chemical reaction
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Spalling fracture of Ni/Al nanolaminates influenced by chemical reaction

机译：用化学反应影响的Ni / Al纳米胺的剥落骨折

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摘要

We investigate spalling behaviors of Ni/Al nanolaminates by molecular dynamics simulations. First,we discuss spalling damage distributions in shocked Ni/Al nanolaminates. Voids nucleate in Al layers,while no voids are located in Ni layers or along the Ni/Al interfaces. This is because the spall strength of single-crystalline Ni is higher than that of single-crystalline Al. We reveal influences of a shock-induced chemical reaction on dynamic spalling damage and fracture processes. An abnormal "decrease → increase → decrease" zigzag variation tendency of the spall strength of Ni/Al nanolaminates as the impact velocity increase is observed in our simulations,which resulted from combining effects of micro-structures,chemical reactions,and temperature softening. When the impacting intensity is relatively low,the spall strength of Ni/Al nanolaminates decreases as the impact velocity increases due to micro-structure effects. However,when the loading velocity increases to a certain magnitude (2.5 km/s),the intimate contact of liquid Al with amorphous Ni near the interface makes the chemical reaction rate increase rapidly to form a large amount of Ni/Al alloys and enhances the spall strength.
机译：通过分子动力学模拟研究Ni / Al纳米胺的剥落行为。首先，我们讨论震动Ni / Al纳米胺中的剥落损伤分布。在Al层中空隙成核，而没有空隙位于Ni层或沿Ni / Al接口中。这是因为单晶Ni的倒置强度高于单晶Al的倒置强度。我们揭示了对抗诱导的化学反应对动态剥落损伤和断裂过程的影响。在我们的模拟中观察到Ni / Al纳米胺的泡出强度的异常“减少→增加→降低”Zigzag变化趋势，这是由于微结构，化学反应和温度软化的影响。当冲击强度相对较低时，随着微结构效应的影响速度增加，Ni / Al纳米胺的泡出强度降低。然而，当加载速度增加到一定幅度（2.5 km / s）时，液体Al与界面附近的无定形Ni的紧密接触使得化学反应速率迅速增加以形成大量的Ni / Al合金并增强击打力量。

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  • 来源
    《Journal of Applied Physics》 |2021年第7期|075103.1-075103.7|共7页
  • 作者

    Xia Tian; Meizhen Xiang; Junzhi Cui; Guangyu Ji; Zhuojia Fu;

  • 作者单位

    College of Mechanics and Materials HoHai University Nanjing 210098 China;

    Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China;

    LSEC ICMSEC Academy of Mathematics and Systems Science CAS Beijing 100190 China School of Mathematical Sciences University of Chinese Academy of Sciences Beijing 100049 China;

    College of Civil and Transportation Engineering HoHai University Nanjing 210098 China;

    College of Mechanics and Materials HoHai University Nanjing 210098 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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