A Basic Research for Conquest Drawbacks and Further Improvement of Properties of Heterogeneous-Nano Structured Copper Alloys

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  • Miura Hiromi
    Department of Mechanical Engineering, Toyohashi University of Technology
  • Arai Kaiki
    Department of Mechanical Engineering, Toyohashi University of Technology
  • Kobayashi Masakazu
    Department of Mechanical Engineering, Toyohashi University of Technology
  • Sumino Yuya
    Copper Rolled Products Unit, Advanced Materials Business, Kobe Steel, Ltd.
  • Watanabe Chihiro
    Faculty of Mechanical Science and Engineering, Kanazawa University

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Abstract

<p>Changes in the microstructure and various properties of heavily cold-rolled Cu–Zn system alloys with small amounts of Ag were systematically investigated. While a typical heterogeneous nanostructure (HN) was evolved in all the alloys, the texture and ratio of the microstructural components developed were slightly varied depending on the added amount of Ag and Zn. The characteristic “eye”-shaped twin domains tended to evolve more significantly with increasing addition of these elements. Thermal stability of the HN structure appeared to be improved by Ag addition. This was due to grain-boundary segregation (GBS) of Ag, which enabled sufficient age hardening. The GBS in the HN structure also resulted in the improvement of electrical conductivity. In this way, all the alloys showed quite high-tensile strength over 900 MPa along transvers direction with superior electrical conductivity around or over 30% IACS. Maximum tensile strength achieved was 990 MPa with 34.5% IACS for Cu–30 mass%Zn–1 mass%Ag alloy.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Japan Inst. Copper 61 (2022) 1–8. Figure 1 and Table 3 were slightly modified from the original version.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 64 (5), 967-973, 2023-05-01

    The Japan Institute of Metals and Materials

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