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The effect of microstructure heterogeneity on the microscale deformation of ultrafine-grained aluminum

机译:微观结构异质性对超细晶粒铝微观形变的影响

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摘要

A combined approach of scanning electron microscopy and digital image correlation was used to examine microstructure-scale strain localization and active deformation mechanisms in ultrafine-grained (UFG) high purity (99.99%) aluminum processed by equal-channel angular pressing (ECAP). The results from tensile tests demonstrate a strong relationship between the heterogeneous microstructure and strain localization. The localized deformation was investigated in areas that contain significantly different microstructural features typical of ECAP processed aluminum. It was found that areas of the UFG microstructure containing primarily low angle grain boundaries deformed by dislocation slip and behaved similarly to a coarse-grained material. The greatest strain localization occurred at high angle grain boundaries (HAGBs) separating distinct microstructure regions and with median surface trace angles of approximately 26.6°. In areas of banded microstructure, shear strain localization as high as 30% and shear displacements of up to 500 nm occurred at the HAGBs separating bands, suggesting grain boundary sliding.
机译:扫描电子显微镜和数字图像相关性相结合的方法用于检查通过等通道角压(ECAP)处理的超细晶粒(UFG)高纯度(99.99%)铝的微观结构尺度应变定位和主动变形机制。拉伸试验的结果证明了异质微观结构与应变局部化之间的密切关系。在包含明显不同的ECAP处理铝的微观结构特征的区域中研究了局部变形。已经发现,UFG组织的主要包含低角度晶界的区域由于位错滑移而变形并且表现得与粗晶粒材料相似。最大的应变局部化发生在高角度晶界(HAGBs)处,该晶界将不同的微结构区域分开,中位表面痕迹角约为26.6°。在带状组织的区域中,在HAGBs分离带处发生了高达30%的剪切应变局部化和高达500 nm的剪切位移,表明晶界滑动。

著录项

  • 来源
    《Journal of Materials Research》 |2014年第15期|1664-1674|共11页
  • 作者单位

    Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan 48109, USA;

    Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand;

    Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1453, USA,Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, United Kingdom;

    Department of Materials Science & Engineering, The University of Michigan, Ann Arbor, Michigan 48109, USA,Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan 48109, USA;

  • 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);
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  • 正文语种 eng
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