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Deformation-induced nanocrystallization: A comparison of two amorphous Al-based alloys

机译:变形诱导纳米晶化:两种非晶态铝基合金的比较

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摘要

Using conventional and high-resolution transmission electron microscopy (HRTEM), the effects of rolling at room temperature on the microstructures of amorphous Al_(90)Fe_5Gd_5 and A1_(86.8)Ni_(3.7)Y_(9.5) were compared. In rolled Al_(90)Fe_5Gd_5, nanocrystallites were observed at shear bands, whereas none were observed in rolled A1_(86.8)Ni_(3.7)Y_(9.5). When HRTEM was combined with with Fourier transform filtering, nanoscale, low-density defects were imaged. In Al_(90)Fe_5Gd_5, the shear bands contain few defects, which are concentrated at the boundary zone between the shear bands and undeformed region, whereas in A1_(86 8)M_(3 7)Y_(9.5), the shear bands contain a uniform distribution of defects with a density higher than the undeformed region. The preferential precipitation of nanocrystallites in rolled Al_(90)Fe_5Gd_5 is attributed to a kinetic effect due to uniformly-distributed excess free volume in the shear bands.
机译:使用常规和高分辨率透射电子显微镜(HRTEM),比较了室温下轧制对非晶Al_(90)Fe_5Gd_5和Al_(86.8)Ni_(3.7)Y_(9.5)的显微组织的影响。在轧制的Al_(90)Fe_5Gd_5中,在剪切带上观察到纳米微晶,而在轧制的Al_(86.8)Ni_(3.7)Y_(9.5)中未观察到纳米微晶。当HRTEM与傅立叶变换滤波结合使用时,可以对纳米级的低密度缺陷成像。在Al_(90)Fe_5Gd_5中,剪切带几乎没有缺陷,这些缺陷集中在剪切带和未变形区域之间的边界区域,而在A1_(86 8)M_(3 7)Y_(9.5)中,剪切带包含缺陷的均匀分布,其密度高于未变形区域。轧制的Al_(90)Fe_5Gd_5中纳米微晶的优先析出归因于动力学效应,这归因于剪切带中均匀分布的多余自由体积。

著录项

  • 来源
    《Journal of Materials Research》 |2005年第3期|p.696-702|共7页
  • 作者单位

    Department of Nuclear Engineering and Radiological Sciences, University' of Michigan, Ann Arbor, Michigan 48109;

  • 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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