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Microstructural evolution of rhenium Part Ⅱ: Tension

机译：en的组织演变第二部分：张力

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摘要

A comprehensive study of the microstructural evolution of pure rhenium during compression has been conducted using TEM and EBSD analysis. Under compression, slip and dislocation plasticity was predominantly active in the low strain regime, with{112̅1}〈112̅6〉twinning occurring at all strain amounts and dominating after yield. This is contrary to deformation twins typically being active during the initial low strain regime of twinning dominated metals. It was observed that twins could bypass grain boundaries, as previously reported. In addition, a mechanism of twins “jogging” along the c-axis past twin boundaries was observed using TEM. This mechanism allowed for multiple twin variants to be active within individual grains. Twin “jogging” helps to explain the excellent ductility in rhenium accommodating the lack of dislocation plasticity. Postmortem TEM imaging showed dislocation density steadily increased around the twins, a result of twin boundaries impeding dislocation slip, confirming observations seen in highly work-hardened tension samples. Additionally, dislocation populated twin boundaries have shown{112̅1}〈112̅6〉type twins resist growing in size when surrounded by dislocations, tending instead to form new twins as strain increases.
机译：使用TEM和EBSD分析对纯compression在压缩过程中的微观结构演变进行了全面研究。在压缩下，滑移和位错可塑性在低应变状态下占主导地位，在所有应变量下都发生{112̅1} 〈112̅6〉孪生，并在屈服后占主导地位。这与变形孪晶相反，该孪晶通常在孪晶主导金属的初始低应变状态下处于活动状态。如先前报道，观察到双胞胎可以绕过晶界。此外，使用TEM观察到了双胞胎沿c轴“飞越”双胞胎边界的机制。这种机制允许多个孪生变体在单个谷物中活跃。双胞胎“慢跑”有助于解释rh缺乏可塑性的情况下出色的延展性。事后TEM成像显示，孪晶周围的位错密度稳定增加，这是孪晶边界阻止位错滑移的结果，证实了在高度加工硬化的拉伸样品中观察到的观察结果。此外，位错填充的孪晶边界显示{112̅1} 〈112̅6〉型孪晶在被位错围绕时会抵抗尺寸的增长，而随着应变的增加趋向于形成新的孪晶。

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  • 来源
    《Materials Science and Engineering》 |2018年第8期|259-272|共14页
  • 作者

    Julian E.C. Sabisch; Andrew M. Minor;

  • 作者单位

    Department of Materials Science and Engineering, University of California, Berkeley and National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory;

    Department of Materials Science and Engineering, University of California, Berkeley and National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory;

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  • 正文语种 eng
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  • 关键词

    Rhenium; HCP; Twinning; Compression; Electron Microscopy;

    机译：hen;HCP;孪生;压缩;电子显微镜;

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