高濃度Al-Mg合金における超塑性的挙動

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タイトル別名
  • Superplastic-Like Behavior for Al-Mg Alloys with High Concentration of Magnesium
  • コウノウド Al Mg ゴウキン ニ オケル チョウソセイテキ キョドウ

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High temperature deformation behavior of coarse grained Al-Mg alloys, the Mg content of which is 7 mol%, 9 mol% and 11 mol%, has been investigated with a special reference to the effect of solute contents on the ductility in the temperature range between 613 K and 753 K, and strain rate range between 1×10−4 s−1 and 1×10−1 s−1. At low strain rate, and hence at low stresses, the stress exponent (n) is three for all alloys, showing that the deformation is rate controlled by the viscous glide of dislocations, or by the solute drag creep. Especially extended elongation of over 250% is obtained for both Al-7Mg and Al-9Mg alloys, which should be called superplastic-like behavior. The elongation of Al-11Mg alloy, however, is smaller than 200% in spite of Class I type deformation behavior. This should probably be ascribed to void-like defects caused during the rolling process, in addition to the partial melting of low Tm phase segregating at grain boundaries. At high strain rates (and hence high stresses), the exponent n is about five, meaning that the deformation is rate controlled by power low creep, and the ductility remains relatively low.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 66 (5), 476-484, 2002

    公益社団法人 日本金属学会

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