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Deformation of as-fabricated and helium implanted 100 nm-diameter iron nano-pillars

机译:人造氦气植入的直径100 nm的铁纳米柱的变形

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摘要

<101>-oriented cylindrical single crystalline Fe samples with diameters of 100 nm and heights of 1 μm were implanted with 0.36 ± 0.06 at% helium throughout their gauge sections. Uniaxial deformation experiments revealed a 40% higher yield and ultimate strengths in tension and a 25% higher yield strength and flow stress at 10% plastic strain in compression for implanted samples compared with as-fabricated ones. Observed tension-compression asymmetry in implanted pillars was attributed to the non-planarity of screw dislocation cores and to twinning-antitwinning deformation typical of bcc metals and the interaction between dislocations and He bubbles. Compressive stress-strain data in both sets of samples had three distinct regimes: (1) elastic loading followed by (2) discrete strain bursts during plastic flow with significant hardening up to strains of 5%, and (3) "steady state" discrete plasticity characterized by nearly-constant average flow stress. Each regime is discussed and explained in terms of competition in the rates of dislocation multiplication and dislocation annihilation.
机译:直径为100 nm且高度为1μm的<101>定向圆柱单晶铁样品在其整个标称截面上注入了0.36±0.06 at%的氦气。单轴变形实验显示,与人造样品相比,在10%塑性变形下,植入样品的拉伸强度和极限强度高40%,屈服强度和流动应力高25%。观察到的植入柱中的拉伸-压缩不对称性归因于螺钉位错核的非平面性以及bcc金属典型的孪生-抗缠绕变形以及位错与He气泡之间的相互作用。两组样品中的压缩应力-应变数据均具有三种不同的状态:(1)弹性载荷,其次(2)塑性流动过程中的离散应变破裂,显着硬化至5%的应变,以及(3)“稳态”离散可塑性具有几乎恒定的平均流应力。根据位错倍增和位错an灭率的竞争来讨论和解释每种制度。

著录项

  • 来源
    《Materials Science and Engineering》 |2014年第26期|316-325|共10页
  • 作者单位

    Department of Materials Science and Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA;

    Department of Materials Science and Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA,State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China;

    Department of Nuclear Engineering, University of California at Berkeley, Berkeley, CA 94720, USA;

    Ion Beam Materials Laboratory, Los Alamos National Laboratories, Los Alamos, NM 87545, USA;

    Department of Materials Science and Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA,The Kavli Nanoscience Institute, California Institute of Technology, USA;

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

    Nanoscale plasticity; Tension test; Compression test; Iron; Helium implantation;

    机译:纳米级可塑性;拉伸试验;压缩试验;铁;氦注入;

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