CrとBを添加したCu-14Al-3Ni形状記憶合金の超塑性挙動

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タイトル別名
  • Superplastic Bahavior of Cu-14 Al-3 Ni Shape Memory Alloys Containing Cr and B
  • Cr ト B オ テンカシタ Cu 14Al 3Ni ケイジョウ キオク ゴウ

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Effects of Cr and B additions on the ductility of a Cu-14 mass%Al-3 mass%Ni shape memory alloys at 973 K in a (β+γ2) two-phase region were investigated by tensile-testing and optical microscopy.<BR>Tensile-specimens were prepared from the alloy sheets hot-rolled at 973 K. The grain size and volume fraction of β and γ2 phases in the specimens were controlled by the hotrolling and additions of Cr and B. The additions of these elements promoted the grain refinement of β and γ2 phases and the equalizing of the volume fraction of these phases. The minimum γ2 grain size, 6 μm, and the maximum γ2 volume fraction, 0.45, were obtained in the case of 0.05%B and 0.1%Cr additions.<BR>As the result, on tensile-testing at 973 K, the specimens containing Cr and B were deformed superplastically without necking, while the non-added specimen was fractured by necking. The maximum elongation values obtained were 73% for the non-added alloy, 132% for the 0.5%Cr alloy, and 173% for the 0.05%B and 0.1%Cr alloy. The maximum values of the strain rate sensitivity index (m) were 0.2 for the non-added alloy, 0.35 for the 0.5%Cr alloy, and 0.4 for the 0.05%B and 0.1%Cr alloys.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 51 (9), 824-829, 1987

    公益社団法人 日本金属学会

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