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Observation of structural anisotropy in metallic glasses induced by mechanical deformation

机译:机械变形引起的金属玻璃结构各向异性的观察

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摘要

We have investigated atomic structure of a Fe_(81)B_(13)Si_4C_2 metallic glass after mechanical creep deformation. We determined the structure function and pair density function resolved for azimuthal angle using x-ray scattering and a two-dimensional detector. The results are analyzed by the spherical harmonics expansion, and are compared to the often-used simple analysis of the anisotropic pair density function determined by measuring the structure function along two directions with respect to the stress. We observed uniaxial structural anisotropy in a sample deformed during creep experiment. The observed macroscopic shear strain is explained in terms of local bond anisotropy induced by deformation at elevated temperature. The bond anisotropy is a "memory" of this deformation after load was removed. We showed that use of sine-Fourier transformation to anisotropic glass results in systematic errors in the atomic pair distribution function.
机译:我们研究了机械蠕变变形后Fe_(81)B_(13)Si_4C_2金属玻璃的原子结构。我们使用X射线散射和二维检测器确定了针对方位角解析的结构函数和对密度函数。通过球谐谐振展开分析结果,并将其与通过对应力沿两个方向测量结构函数确定的各向异性对密度函数的常用简单分析进行比较。我们观察到蠕变实验过程中变形的样品中的单轴结构各向异性。观察到的宏观剪切应变用高温变形引起的局部键各向异性来解释。键各向异性是去除载荷后这种变形的“记忆”。我们表明,对各向异性玻璃使用正弦傅里叶变换会导致原子对分布函数出现系统误差。

著录项

  • 来源
    《Journal of Materials Research》 |2007年第2期|412-418|共7页
  • 作者

    Wojtek Dmowski; Takeshi Egami;

  • 作者单位

    Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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