Prediction and Experimental Validation of Cooling Rate Dependence of Viscoplastic Properties in a Partially Solidified State of Al–5 mass%Mg Alloy

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  • Hirohara Rei
    Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University
  • Kawada Yasutaka
    Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University
  • Takai Ryosuke
    Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University
  • Otaki Mitsuhiro
    Japan Aluminium Association
  • Okane Toshimitsu
    National Institute of Advanced Industrial Science and Technology
  • Yoshida Makoto
    Kagami Memorial Research Institute for Materials Science and Technology, Waseda University

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<p>To predict hot tearing in direct chill (DC) casting and shape casting of aluminum alloys using thermal stress analysis, cooling rate dependence of viscoplastic properties in a partially solidified state is indispensable. Based on viscoplastic properties determined from experiments, this study develops a method to predict the temperature dependence of viscoplastic properties at an arbitrary cooling rate through the Clyne–Kurz microsegregation model. For validation of the developed method, tensile tests were performed on Al–5 mass%Mg alloy in a partially solidified state at three cooling rates. Results show good agreement between the predicted values and experimentally obtained values, which demonstrates that the developed method is effective for predicting the cooling rate dependence of viscoplastic properties.</p><p> </p><p>This Paper was Originally Published in Japanese in J. JILM 67 (2017) 214–221.</p>

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