Microstructure and Mechanical Properties of the Heterogeneous-Nano Structured Cu–Be System Alloys

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  • Jiang H.
    Division of Mechanical Science and Engineering, Graduate School of Natural Science and Technology, Kanazawa University
  • Watanabe C.
    Faculty of Mechanical Engineering, Institute of Natural Science and Engineering, Kanazawa University
  • Miura H.
    Department of Mechanical Engineering, Toyohashi University of Technology
  • Muramatsu N.
    Engineering and R&D, New Metals Division, NGK Insulators, Ltd.

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Abstract

<p>Microstructures and mechanical properties of Cu–Be–Co alloys having four different Be contents prepared by simply heavy cold rolling (CR) were systematically investigated. The cold-rolled alloys exhibited excellent mechanical properties due to development of heterogeneous nano-structure (HN), which consisted of “eye”-shape deformation twin domains surrounded by shear bands, and they were further embedded in conventional low-angle lamellae. The strength of each alloy increased with increasing Be content. The volume fraction of the twin domains quantitatively evaluated by the texture analyses that increased with increasing Be content rapidly from 0.40 mass% to 1.27 mass% and gradually from 1.27 mass% up to 2.14 mass%. The latter stagnation was attributed to the formation of coarse intermetallic particles, which impeded the formation of the HN structure. It revealed that the strength was correlated closely with the volume fraction of twin domains.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Japan Institute of Copper 60 (2021) 81–86.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 63 (1), 21-26, 2022-01-01

    The Japan Institute of Metals and Materials

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