Layer Thickness-Dependent Hardness and Strain Rate Sensitivity of Cu–Al/Al Nanostructured Multilayers

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• 作者：Ya-Qiang Wang ; Zhao-Qi Hou ; Jin-Yu Zhang…
• 关键词：Nanostructured films ; Cu–Al/Al multilayers ; Hardness ; Strain rate sensitivity ; Layer thickness dependence
• 刊名：Acta Metallurgica Sinica (English Letters)
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：29
• 期：2
• 页码：156-162
• 全文大小：2,351 KB
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• 作者单位：Ya-Qiang Wang (1)
  Zhao-Qi Hou (1)
  Jin-Yu Zhang (1)
  Xiao-Qing Liang (1)
  Gang Liu (1)
  Guo-Jun Zhang (2)
  Jun Sun (1)
  
  1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China
  2. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, China
  
• 刊物主题：Metallic Materials; Spectroscopy/Spectrometry; Organometallic Chemistry; Tribology, Corrosion and Coatings; Nanotechnology; Characterization and Evaluation of Materials;
• 出版者：Springer Berlin Heidelberg
• ISSN：2194-1289

文摘

Cu–Al/Al nanostructured metallic multilayers with Al layer thickness h _Al varying from 5 to 100 nm were prepared, and their mechanical properties and deformation behaviors were studied by nanoindentation testing. The results showed that the hardness increased drastically with decreasing h _Al down to about 20 nm, whereafter the hardness reached a plateau that approaches the hardness of the alloyed Cu–Al monolithic thin films. The strain rate sensitivity (SRS, m), however, decreased monotonically with reducing h _Al. The layer thickness-dependent strengthening mechanisms were discussed, and it was revealed that the alloyed Cu–Al nanolayers dominated at h _Al ≤ 20 nm, while the crystalline Al nanolayers dominated at h _Al > 20 nm. The plastic deformation was mainly related to the ductile Al nanolayers, which was responsible for the monotonic evolution of SRS with h _Al. In addition, the h _Al-dependent hardness and SRS were quantitatively modeled in light of the strengthening mechanisms at different length scales.