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Effect of strain rate on tensile mechanical properties of high-purity niobium single crystals for SRF applications

机译：应变率对SRF应用高纯度铌单晶拉伸力学性能的影响

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摘要

An investigation of the mechanical properties of high-purity niobium single crystals is presented. Specimens were cut with different crystallographic orientations from a large grain niobium disk and uniaxial tensile tests were conducted at strain rates between 10~(-4) and 10~3 s ~(-1)The logarithmic strain rate sensitivity for crystals oriented close to the center of a tensile axis inverse pole figure (1PF) is ~0.14 for all strain rates. The strain at failure (ranging from 0.4 to 0.9) is very sensitive to crystal orientation and maximal at -10~(-2) s~(-1) for crystals oriented close to the center of an IPF. The high anisotropy observed at quasi-static strain rates decreased with increasing strain rate. The activation of multiple slip systems in the dynamic tests could account for this reduction in anisotropy. A transition from strain hardening to softening in the plastic domain was observed at strain rates greater than approximately 6 × 10'2 s~(-1) for crystals oriented close to the center of a tensile axis IPF. Shear bands were observed in specimens with orientations having similarly high Schmid factors on both {110}and {112}slip families, and they are correlated with reduced ductility. Crystal rotations at fracture are compared for the different orientations using scanning electron microscopy images and EBSD orientation maps. A rotation toward the terminal stable [101] orientation was measured for the majority of specimens (with tensile axes more than ～17° from the [001] direction) at strain rates between 1.28 × 10'2 and 1000 s~(-1).
机译：提出了高纯度铌单晶力学性能的研究。用来自大颗粒铌盘的不同晶体取向切割标本，并且在10〜（-4）和10〜3 s〜（-1）的应变速率下进行单轴拉伸试验的对数应变速率敏感性靠近晶体的对数应变速率灵敏度所有应变速率的拉伸轴逆极图（1PF）的中心为0.14。故障的菌株（范围为0.4至0.9）对晶体取向非常敏感，并且在-10〜（-2）S〜（-1）中最大为定向靠近IPF的中心的晶体。以准静态应变率观察的高各向异性随着应变率的增加而降低。动态测试中的多个滑动系统的激活可以解释各向异性的降低。以大于约6×10'2S〜（-1）的应变速率观察到塑料结构域中塑料结构域软化的应变率的过渡，用于靠近拉伸轴IPF的中心的晶体。在{110}和{112}滑动家庭上以具有类似高的施联因子的定向的标本中观察到剪切带，并且它们与降低的延展性相关。使用扫描电子显微镜图像和EBSD定向图比较裂缝处的晶体旋转。针对大多数样品测量朝向端子稳定的旋转[101]取向（在从[001]方向上大于〜17°的拉伸轴），在1.28×10'2和1000 s〜（-1）之间的应变速率下。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140258.1-140258.15|共15页
  • 作者

    J.-F. Croteau; E. Pai Kulyadi; C. Kale; D. Siu; D. Kang; A.T. Perez Fontenla; E. Garcia-Tabares Valdivieso; T.R. Bieler; P. Eisenlohr; K.N. Solanki; D. Balint; P.A. Hooper; S. Atieh; N. Jacques; E. Cantergiani;

  • 作者单位

    I-Cube Research 30 boulevard de Thibaud 31104 Toulouse France ENSTA Bretagne UMR CNRS 6027 IRDL 2 rue François Verny Brest Cedex 9 F-29806 France;

    Chemical Engineering and Materials Science Michigan State University East Lansing MI 48824-1226 USA;

    School for Engineering of Matter Transport and Energy Arizona State University Tempe AZ 85287 USA;

    Department of Mechanical Engineering Imperial College London London SW7 2AZ United Kingdom;

    Chemical Engineering and Materials Science Michigan State University East Lansing MI 48824-1226 USA;

    European organization for Nuclear Research (CERN) 1211 Geneva Switzerland;

    European organization for Nuclear Research (CERN) 1211 Geneva Switzerland;

    Chemical Engineering and Materials Science Michigan State University East Lansing MI 48824-1226 USA;

    Chemical Engineering and Materials Science Michigan State University East Lansing MI 48824-1226 USA;

    School for Engineering of Matter Transport and Energy Arizona State University Tempe AZ 85287 USA;

    Department of Mechanical Engineering Imperial College London London SW7 2AZ United Kingdom;

    Department of Mechanical Engineering Imperial College London London SW7 2AZ United Kingdom;

    European organization for Nuclear Research (CERN) 1211 Geneva Switzerland;

    ENSTA Bretagne UMR CNRS 6027 IRDL 2 rue François Verny Brest Cedex 9 F-29806 France;

    I-Cube Research 30 boulevard de Thibaud 31104 Toulouse France Max-Planck-Institut fuer Eisenforschung Max-Planck-Strasse 1 40237 Diisseldorf Germany;

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  • 正文语种 eng
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  • 关键词

    Stress/strain measurements; Niobium; Single crystal; High strain rate; Anisotropy; SRF;

    机译：应力/应变测量;铌;单晶;高应变率;各向异性;SRF.;

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