６０６１基アルミニウム合金の破壊靭性に及ぼすＳｉ添加の影響

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タイトル別名
  • Effect of Si addition on fracture toughness of 6061-based aluminum alloys
  • 6061キ アルミニウム ゴウキン ノ ハカイジンセイ ニ オヨボス Si テンカ ノ エイキョウ

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In order to evaluate fracture toughness property of 6061-T6 aluminum alloys including Si particles, fracture toughness tests under mode I, mode II and mixed-mode I–II loadings were carried out for extruded alloy plates with various Si contents to 6 mass%, and the fracture process was studied by metallographic observations together with FEM stress analysis. Under tensile tests, Si-particles with a relatively rough size of 3–4 μm was found to crack themselves or exfoliate at interfaces with matrix, taking a role of preferential void formation sites, and to lead a reduction in ductility. Mode I fracture toughness JIa rapidly decreased with an increase in additional Si contents, where JIa of alloy #4 with 6 mass% Si fell to 11.5 kN/m, about a quarter of that of the base 6061 alloy #1 with 0.7 mass%Si. Mode II fracture toughness JIIa was substantially higher than JIa, showing a mild reduction with Si addition. These results could support mechanism of fine chip formation was dominated by mode I fracture. Mode I fracture of alloy #4 was induced in the preferential damage zone of Si particles ahead of notch root, where the principal stress σ1 exceeded the true fracture stress σfa in tension. Mode II fracture of alloy #4 in the inclined direction θ=−40° ahead of notch root was also supported to take place based on the above criterion.

収録刊行物

  • 軽金属

    軽金属 56 (5), 271-276, 2006

    一般社団法人 軽金属学会

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