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Metallurgical and Materials Transactions A

, Volume 49, Issue 10, pp 4947–4955 | Cite as

Microstructure Evolution in Cu-Pd-Ag Alloy Wires During Heat Treatment

  • Chihiro IwamotoEmail author
  • Naoki Adachi
  • Fumio Watanabe
  • Risei Koitabashi
Article

Abstract

Cu-Pd-Ag alloy wires with a relatively low Ag content are used widely in electronics. This alloy is usually subjected to age hardening to increase its strength. However, the alloy microstructure that results when the alloy is processed as a wire has not been clarified sufficiently to elucidate the hardening mechanism. A clarification of the microstructure is critical to control the mechanical properties of the alloy wire. In this study, we investigated the detailed microstructure variation of the alloy wire after heat treatment. Microscopy showed that the alloy wire contained many parallel rods with an Ag-rich α phase that extended along the axial direction of a Cu-rich α-phase matrix before heat treatment. After heat treatment at 623 K for 1 hour, the morphology of the rods in the matrix remained mostly unchanged. Detailed observations revealed that the matrix was transformed to a nanolamellar structure with β and α2 phases. Many β′ phases with a thickness of a few atomic layers precipitated in the rods. Both nanostructures investigated in this study were expected to contribute to wire hardening through a short-fiber strengthening mechanism.

Notes

Acknowledgments

The authors are very grateful to Mr Kouichi Fukagawa in Yokowo Co., Ltd. for his support in this study. A part of this work was conducted at Advanced Characterization Nanotechnology Platform of the University of Tokyo, supported by “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. We thank Laura Kuhar, Ph.D., from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Chihiro Iwamoto
    • 1
    Email author
  • Naoki Adachi
    • 2
    • 3
  • Fumio Watanabe
    • 4
  • Risei Koitabashi
    • 4
  1. 1.Department of Materials Science and Engineering, College of EngineeringIbaraki UniversityHitachiJapan
  2. 2.Graduate School of Science and EngineeringIbaraki UniversityHitachiJapan
  3. 3.Nippon Steel & Sumikin TechnologyKashima-shiJapan
  4. 4.Yokowo Co., LtdTomioka-shiJapan

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