Effect of Amount of Solute Atoms on Development of Heterogeneous–nano Structure in Cu–Ni–Si Alloys

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  • Sumino Yuya
    Research & Development Section Copper Rolled Products Plant Copper Rolled Products Unit Advanced Materials Business, KOBE STEEL, LTD.
  • Watanabe Chihiro
    Faculty of Mechanical Engineering Kanazawa University
  • Sakamoto Hiroshi
    Research & Development Section Copper Rolled Products Plant Copper Rolled Products Unit Advanced Materials Business, KOBE STEEL, LTD.

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  • Cu–Ni–Si系合金のヘテロナノ組織の発達に及ぼす溶質原子添加量の影響
  • Cu-Ni-Siケイ ゴウキン ノ ヘテロナノ ソシキ ノ ハッタツ ニ オヨボス ヨウシツ ゲンシ テンカリョウ ノ エイキョウ

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Abstract

<p>The effects of amount of solute atoms on the formation of heterogeneous–nano structure in Cu–Ni–Si system alloys was investigated using Cu–2.01mass%Ni–0.44mass%Si, Cu–3.03mass%Ni–0.65mass%Si, Cu–3.60mass%Ni–0.77mass%Si, and Cu–4.2mass%Ni–0.91mass%Si alloys. All the alloys were subjected to solution–treatment and subsequent cold–rolling up to a reduction of 90% in thickness. In each alloy, conventional lamellae parallel to the rolling direction were formed after cold rolling. As the Ni and Si contents increased, in addition to the lamellae, shear bands with an angle to the rolling direction and deformation twin domains surrounded by the shear bands were formed, eventually leading to the development of distinct heterogeneous–nano structure. The Cu–4.2mass%Ni–0.91mass%Si alloy after the cold rolling was aged at 450°C for 5 min, and an excellent tensile strength of 964 MPa was achieved.</p>

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