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The Effect of He Implantation on the Tensile Properties and Microstructure of Cu/Fe Nano-Bicrystals

机译：He注入对Cu / Fe纳米双晶体拉伸性能和微观结构的影响

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摘要

In situ uniaxial tensile experiments on as-fabricated and helium-implanted 100 nm-diameter Cu/Fe bicrystals unearth the effect of individual face-centred-cubic/body-centred-cubic (fcc-bcc) interfaces on improving radiation-damage tolerance and helium absorption. Arrays of nanotensile specimens, each containing a single Cu grain in the bottom half and a single Fe grain on top, were fabricated by templated electron-beam lithography and electrodepo-sition. Helium is implanted at 200 keV to a dose of 10~(14) ion/cm~2 nominally into the interface region. High-resolution, site-specific transmission electron microscopy (TEM) and through-focus analysis reveal that the interfaces are nonplanar and contain ≈5 nm-spaced He bubbles with diameters of 1-2 nm. Nanomechanical experimental results show that the irradiated samples exhibit yield and ultimate tensile strengths more than 60% higher than the as-fabricated ones, while they retain comparable ductility. Tensile failure always occurs gradually, along the interfaces, with no noticeable shape localization. The absence of brittle failure in He-irradiated metals might be explained, in part, by the inability of the small He bubbles to serve as sufficient stress concentrators for cracking. In addition, the non-orthogonal orientation of the interfaces with respect to the loading axes results in the development of both normal- and shear-stress components. Tensile loading along the pillar axes may cause those interfacial regions subjected to normal stresses to detach, while the inclined regions, subjected to shear, to carry plastic deformation until final fracture.
机译：原位和氦注入的100 nm直径Cu / Fe双晶原位单轴拉伸实验揭示了单个面心立方/体心立方（fcc-bcc）界面对改善辐射损伤耐受性和氦吸收。通过模板电子束光刻和电沉积，制造了纳米拉伸样品的阵列，每个样品的下半部分包含单个Cu晶粒，顶部包含单个Fe晶粒。将氦气以200 keV的名义注入界面区域，剂量为10〜（14）ion / cm〜2。高分辨率，特定于位置的透射电子显微镜（TEM）和通过焦点分析显示，界面是非平面的，并且包含≈5 nm间隔的He气泡，直径为1-2 nm。纳米力学实验结果表明，被辐照的样品比制成的样品具有更高的屈服强度和极限抗拉强度，比制成的样品高出60％以上，而它们仍具有相当的延展性。拉伸破坏总是沿着界面逐渐发生，没有明显的形状局部化。 He辐照的金属没有脆性破坏，部分原因是小的He气泡无法充当裂纹的足够应力集中器。另外，界面相对于加载轴的非正交取向导致法向应力分量和剪切应力分量的发展。沿柱轴的拉伸载荷可能会使承受法向应力的界面区域分离，而承受剪切力的倾斜区域会发生塑性变形，直到最终断裂。

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  • 来源
    《Advanced Functional Materials》 |2013年第10期|1281-1288|共8页
  • 作者

    Peri Landau; Q.Cuo; K.Hattar; J.R.Greer;

  • 作者单位

    Materials Science, California Institute of Technology 1200 E.California Blvd, Pasadena CA 91125, USA;

    Materials Science, California Institute of Technology 1200 E.California Blvd, Pasadena CA 91125, USA;

    Radiation-Solid Interactions Sandia National Laboratories Albuquerque NM 87185, USA;

    Materials Science, California Institute of Technology 1200 E.California Blvd, Pasadena CA 91125, USA;

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