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

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  • Jiang Hua
    Graduate School of Natural Science and Technology, Kanazawa University
  • Watanabe Chihiro
    Division of Mechanical Science and Engineering, Kanazawa University
  • Miura Hiromi
    Department of Mechanical Engineering, Toyohashi University of Technology
  • Muramatsu Naokuni
    Engineering and R&D, New Metals Division, NGK INSULATORS, LTD.

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Other Title
  • ヘテロナノ組織Cu–Be系合金の組織と力学的特性
  • ヘテロナノ ソシキ Cu-Beケイ ゴウキン ノ ソシキ ト リキガクテキ トクセイ

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Abstract

<p>Microstructures and mechanical properties of Cu–Be–Co alloys having four different Be contents and prepared by simply heavy cold rolling (CR), were systematically investigated. The cold–rolled alloys exhibited excellent mechanical properties due to the development of heterogeneous–nano (HN) structure during CR, which consists of rhombic deformation twin domains surrounded by shear bands and further embedded in conventional lamella. The strength of each alloy increased with increasing Be content. The volume fraction of twin domains in each alloy was quantitatively evaluated by texture analyses. It increased with increasing Be content rapidly from 0.40 mass% to 1.27 mass% and was gradually up to 2.14 mass%. The latter stagnation was attributed to the formation of coarse particles of intermetallic phases, which inhibited the formation of the HN structure. It revealed that the change in strength was correlated well with the volume fraction of twin domains.</p>

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