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Shock-induced stacking fault pyramids in Ni/Al multilayers

机译:Ni / Al多层膜中的冲击诱导堆积断层金字塔

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摘要

The formations of stacking fault tetrahedra in {111}fcc/{111}fcc multilayers have been studied extensively, but the researches related to {001}fcc/{001} fcc interfaces can rarely be found in the literature. Using molecular dynamics ( MD) simulations, the shock-induced dislocation structure in Ni/Al multilayers was studied in this article, the stacking fault pyramids (SFPs) initiated from Ni/Al interface was firstly observed, and the corresponding mechanism was explored. It was shown that the Shockley partial dislocations dissociated from the rectangular misfit dislocations along Ni/Al interface are first emitted into the Al interlayer and subsequently intersect with each other to form SFPs. With the propagation of the shock front in the multilayers, two adjacent SFPs interact with each other and form Lomer-Cottrell locks. The dislocation sheet composed of SFPs and Lomer-Cottrell locks can act as a barrier to dislocation transmission. The effect of shock piston velocity on the nucleation site of dislocation was also studied. It was shown that dislocations would originate from the interface at a low piston speed (<1.1 km/s), and appear at the shock front if the piston speed exceeds 1.2 km/s. (C) 2017 Elsevier B.V. All rights reserved.
机译:对{111} fcc / {111} fcc多层中的堆叠缺陷四面体的形成已进行了广泛的研究,但是与{001} fcc / {001} fcc界面相关的研究很少见于文献中。利用分子动力学(MD)模拟,研究了Ni / Al多层膜中激振引起的位错结构,首先观察了由Ni / Al界面引发的堆积断层金字塔(SFPs),并探讨了相应的机理。结果表明,沿Ni / Al界面从矩形错配位错解离的Shockley部分位错首先被发射到Al中间层中,然后彼此相交形成SFP。随着冲击前沿在多层中的传播,两个相邻的SFP彼此相互作用并形成Lomer-Cottrell锁。由SFP和Lomer-Cottrell锁组成的位错表可能会成为位错传输的障碍。还研究了冲击活塞速度对位错成核位置的影响。结果表明,位错将以低活塞速度(<1.1 km / s)从界面处产生,并且如果活塞速度超过1.2 km / s,则会在冲击前出现。 (C)2017 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Applied Surface Science》 |2018年第ptaa期|219-225|共7页
  • 作者单位

    Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China|Chongqing Univ, Chongqing Key Lab Heterogeneous Mat Mech, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China|Chongqing Univ, Chongqing Key Lab Heterogeneous Mat Mech, Chongqing 400044, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ni/Al; Shock; Stacking fault pyramid; Dislocation; Molecular dynamics;

    机译:Ni / Al;冲击;堆积断层金字塔;位错;分子动力学;
  • 入库时间 2022-08-18 03:04:38

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