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Deformation Behavior of Pure Copper Castings with As-Cast Surfaces for Electrical Parts

  • Ikuzo GotoEmail author
  • Setsuo Aso
  • Ken-ichi Ohguchi
  • Kengo Kurosawa
  • Hiroyuki Suzuki
  • Hiroyuki Hayashi
  • Jun-ichi Shionoya
Article
  • 42 Downloads

Abstract

Herein, the tensile deformation behavior of pure copper castings with as-cast surfaces was investigated. It was found that small and sufficiently large uniform elongation types corresponded, respectively, to the presence or absence of a Cu-Cu2O eutectic phase in the microstructure. Fissure defects were observed near the as-cast surfaces when the eutectic phase was present, probably leading to stress concentration. On the other hand, surface pinholes were observed when the eutectic phase was absent, and these were not prevented by directional solidification. Although the as-cast specimens (non-directionally solidified) exhibited a slightly reduced uniform elongation compared to the machined specimens in the absence of the eutectic phase, the directionally solidified as-cast samples exhibited a uniform elongation that was similar to that of the machined specimens. In addition, micropore arrays were formed along the grain boundaries inside the castings when the eutectic phase was absent, whereas almost no micropores were observed inside the directionally solidified as-cast specimens because the solidification process involved a faster cooling rate and/or higher temperature gradient. These results do not only suggest the existence of surface pinholes but also indicate that microporosity can reduce the cross-sectional area of the specimens, thus, affecting their uniform elongation.

Keywords

as-cast surface casting and solidification casting defects directional solidification ductility nonferrous metals pure copper 

Notes

Acknowledgments

This study was supported in part by the Japan Institute of Copper. The authors would like to thank Enago (www.enago.jp) for the English language review.

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Ikuzo Goto
    • 1
    Email author
  • Setsuo Aso
    • 1
  • Ken-ichi Ohguchi
    • 1
  • Kengo Kurosawa
    • 2
  • Hiroyuki Suzuki
    • 3
  • Hiroyuki Hayashi
    • 3
  • Jun-ichi Shionoya
    • 3
  1. 1.Department of Materials Science, Graduate School of Engineering ScienceAkita UniversityAkitaJapan
  2. 2.Akita Industrial Technology CenterAkitaJapan
  3. 3.Sanwa Tekki CorporationTokyoJapan

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