Effects of Thickness and Crystallographic Orientation on Fatigue Life of Single-Crystalline Copper Foils

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  • Kammuri Kazuki
    Department of Innovative and Engineered Materials, Tokyo Institute of Technology
  • Kitamura Masashi
    Department of Innovative and Engineered Materials, Tokyo Institute of Technology
  • Fujii Toshiyuki
    Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
  • Kato Masaharu
    Department of Materials Science and Engineering, Tokyo Institute of Technology

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Thickness effect on fatigue life of pure copper single-crystal foils with two different surface orientations, (21\bar{1}) and (5\bar{11}\bar{1}), but with the same stress-axis orientation was investigated by means of S-N curve measurement and microstructural observation. Thicknesses of the foils were in range from 140 to 500 µm. Fatigue life of the (21\bar{1}) specimen was much longer (by a factor of 1000) than that of the (5\bar{11}\bar{1}) specimen within the given range of the foil thickness. The orientation dependence of fatigue life became more pronounced with decreasing the foil thickness. The size and crystal orientation dependence of the fatigue life can be explained reasonably by considering the reduction of the net area of the primary and secondary slip planes during deformation.

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