Controlling factor for maximum tensile stress and elongation of aluminum alloy during partial solidification

Ryosuke Takai, Rei Hirohara, Naoki Endo, Yoshihiro Nagata, Toshimitsu Okane, Makoto Yoshida

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To predict hot tearing of direct chill casting ingot, both the tensile constitutive behavior and elongation of alloy are inevitable during partial solidification. For predicting both the maximum true stress ·ss and the elongation ¾elong regardless of alloy systems, their dominant factor was examined in terms of the solidification microstructure. For an AlMg and an AlCu alloys, (i) temperature T dependences of the maximum true stress and elongation (·ss = f(T) and ¾elong = f(T)) and (ii) dihedral angle ª of liquid phase formed at grain boundary were measured experimentally. Then, fraction of solid cohesion C was determined by the Campbell’s model using the angle. Firstly, the solid fraction dependence of the tensile properties (·ss = f(fs) and ¾elong = f(fs)) were compared between the two alloys. The two dependences differ with each other. Secondly, the fraction of solid cohesion dependences of the tensile properties (·ss = f(C) and ¾elong = f(C)) were compared and the result shows that the two dependences were consistent with each other. The fraction of solid cohesion enables to explain the difference in solid fraction dependence of the tensile properties for the two alloys. The result demonstrates that the dihedral angle should be essential to predict the two tensile properties of alloy during partial solidification. [doi:10.2320/matertrans.L-M2019839]

元の言語English
ページ(範囲)2406-2415
ページ数10
ジャーナルMaterials Transactions
60
発行部数11
DOI
出版物ステータスPublished - 2019 1 1

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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