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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.56  No.2 (2015)  >  pp.200-205

MATERIALS TRANSACTIONS
<<Previous article Vol.56  No.2 (2015)   pp.200 - 205 Next article>>

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

Kazuki Kammuri1), Masashi Kitamura1), Toshiyuki Fujii2), Masaharu Kato3)
1) Department of Innovative and Engineered Materials, Tokyo Institute of Technology 2) Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology 3) Department of Materials Science and Engineering, Tokyo Institute of Technology

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.


Keyword:
copper foil, fatigue, single crystal, crystallographic orientation, slip system

Received: October 02, 2014
Accepted: November 14, 2014 , Published online: January 25, 2015

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