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Effect of microstructural heterogeneity on the mechanical behavior of nanocrystalline metal films

机译:微观结构异质性对纳米晶金属膜力学行为的影响

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摘要

Conventionally, mean grain size is considered the most critical microstructural parameter in determining the mechanical behavior of pure metals. By systematically controlling the distribution of grain orientations in aluminum films, we show that microstructural heterogeneity alone induces large variation in the mechanical behavior of nanocrystalline metal films. Aluminum films with relatively homogeneous microstructure (all grains with identical out-of-plane orientation) show substantially less early Bauschinger effect compared to films with heterogeneous microstructure, irrespective of film thickness or grain size. On the other hand, the films with homogeneous microstructure show relatively higher yield stresses. A direct correspondence is found between the nonuniformity of plastic deformation and early Bauschinger effect, which confirms the critical role of microstructural heterogeneity.
机译:通常,在确定纯金属的机械性能时,平均晶粒尺寸被认为是最关键的微观结构参数。通过系统地控制铝膜中晶粒取向的分布,我们表明仅微结构异质性会引起纳米晶体金属膜力学行为的较大变化。与具有异质微观结构的薄膜相比,具有相对均质的微观结构(所有晶粒具有相同的面外取向)的铝膜表现出的早期包辛格效应要小得多,而与薄膜厚度或晶粒尺寸无关。另一方面,具有均匀微观结构的薄膜显示出相对较高的屈服应力。在塑性变形的不均匀性和早期的鲍辛格效应之间发现了直接的对应关系,这证实了微观结构异质性的关键作用。

著录项

  • 来源
    《Journal of Materials Research》 |2011年第22期|p.2826-2832|共7页
  • 作者单位

    Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801;

    Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801;

  • 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
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