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Microstructural characteristics and formation mechanism of adiabatic shear bands in Al-Zn-Mg-Cu alloy under dynamic shear loading

机译：动态剪切载荷下Al-Zn-Mg-Cu合金中绝热剪切带的微观结构特征及形成机理

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摘要

The microstructural characteristics and formation mechanism of adiabatic shear bands in ultra-high strength aluminum alloy are studied under dynamic shear loading. It is found that thermal softening alone is insufficient to trigger the initiation of adiabatic shear bands (ASBs). Dynamic recrystallization induced softening is attributed to be the main cause of ASB initiation, with temperature rise playing a secondary role by accelerating the deformation localization process. It is believed that abrupt temperature rise takes place after ASB initiation, and the temperature rise prior to ASB formation is relatively small. Recrystallized ultraflne grains with a strong texture of {112} <110> are formed in ASBs, based on a progressive subgrain misorientation recrystallization mechanism. It is proposed that the translational-rotational motion of the dynamically recrystallized nanograins in the form of vortexes at the mesoscale can account for the microstructural softening, thus causing shear instability, eventually leading to fracture by the combination of ductile and brittle failure mechanisms.
机译：在动态剪切载荷下研究了超高强度铝合金绝热剪切带的微观结构特性和形成机理。发现单独的热软化不足以引发绝热剪切带（ASB）的启动。动态重结晶诱导的软化归因于ASB发起的主要原因，通过加速变形定位过程，温度升高发挥次要作用。据信，在ASB开始之后发生突变升温，并且在ASB形成之前的温度上升相对较小。基于渐进子面粒错位重结晶机制，在ASB中形成具有强大{112} <110>的强纹理的超结晶超薄颗粒。提出，Messcale在Messcale的涡旋形式的动态再结晶纳米的平移 - 旋转运动可以考虑微观结构软化，从而引起剪切不稳定性，最终导致延展性和脆性失败机构的组合导致断裂。

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  • 来源
    《Materials Science and Engineering》 |2020年第jul22期|139430.1-139430.9|共9页
  • 作者

    Weiliang Zhang; Liangju He; Zhigang Lu; Gregory B. Kennedy; Naresh N. Thadhani; Peijie Li;

  • 作者单位

    Department of Mechanical Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Tribology Tsinghua University Beijing 100084 China School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA;

    School of Aerospace Engineering Tsinghua University Beijing 100084 China;

    Department of Mechanical Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Tribology Tsinghua University Beijing 100084 China;

    School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA;

    School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA;

    Department of Mechanical Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Tribology Tsinghua University Beijing 100084 China;

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  • 正文语种 eng
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  • 关键词

    Adiabatic shear band; Dynamic recrystallization; Translational-rotational vortexes; Al-Zn-Mg-Cu alloy;

    机译：绝热剪频带;动态再结晶;翻译旋转涡旋;Al-Zn-Mg-Cu合金;

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