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Fine-grained nickel deformed by direct impact at different velocities: Microstructure and mechanical properties

机译：在不同速度下直接受到冲击而变形的细晶粒镍：组织和力学性能

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摘要

High purity electrolytic nickel (99.99%) samples deformed dynamically in compression using a direct impact Hopkison pressure bar test at the velocities of 10.9, 28.2 and 70.6 ms~(-1) were investigated. The dislocation density increased with increasing the impact velocity up to 28.2 m s~(-1) resulting in an increase of nanohardness and quasi-static compressive flow stress. At the same time, a decrease of the fraction of S3 coincident site lattice boundaries was observed for the benefit of ∑1 low angle grain boundaries having misorientations lower than 15°. Increasing the velocity to 70.6 ms~(-1) led to a decrease of the dislocation density, in parallel with the regeneration of ∑3 boundaries. As a consequence, the nanohardness decreased to a similar value as in the initial state. These observations suggest possible dynamic recovery/recrystallization that might have occurred at the highest impact velocity.
机译：研究了直接冲击霍普森压力棒试验在10.9、28.2和70.6 ms〜（-1）速度下压缩时动态变形的高纯度电解镍（99.99％）样品。位错密度随着冲击速度的增加而增加，直至28.2 m s〜（-1），从而导致纳米硬度和准静态压缩流应力的增加。同时，观察到S3重合位点晶界的分数降低，这是由于取向错误低于15°的∑1低角度晶界的好处。将速度提高到70.6 ms〜（-1）会导致位错密度的降低，与∑3边界的再生并行。结果，纳米硬度降低到与初始状态相似的值。这些观察结果表明，在最高冲击速度下可能发生的动态恢复/再结晶。

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  • 来源
    《Materials Science and Engineering》 |2010年第17期|P.4128-4135|共8页
  • 作者

    G. Dirras; H. Couque; J. Gubicza; A. Ouarem; T. Chauveau; P. Jenei;

  • 作者单位

    LPMTM, CNRS UPR 9001, Universite Paris 13,99 Avenue Jean Baptiste Clement, 93430 Villetaneuse, France;

    rnNexter-Munitions, 7 route de Cuerry, 18023 Bourges Cedex, France;

    rnDepartment of Materials Physics, Eoetvoes Lorand University, P.O.B. 32, H-1518, Budapest, Hungary;

    rnLPMTM, CNRS UPR 9001, Universite Paris 13,99 Avenue Jean Baptiste Clement, 93430 Villetaneuse, France;

    rnLPMTM, CNRS UPR 9001, Universite Paris 13,99 Avenue Jean Baptiste Clement, 93430 Villetaneuse, France;

    rnDepartment of Materials Physics, Eoetvoes Lorand University, P.O.B. 32, H-1518, Budapest, Hungary;

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  • 正文语种 eng
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  • 关键词

    nickel; dynamic strain; impact; microstructure; recrystallization;

    机译：镍;动态应变影响;微观结构重结晶;

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