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Solidification modeling and experimental investigation of aluminum-rich aluminum-copper-magnesium-zinc alloys.

机译：富铝铝铜镁锌锌合金的凝固模型和实验研究。

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摘要

The microstructure and microsegregation of two ternary Al-rich alloys, Al-3.9Cu-0.9Mg and Al-15Cu-1Mg, and a quaternary Al-rich Al-3.86Cu-0.89Mg-0.99Zn alloy were studied by using microscopic modeling coupled with the information of real phase diagram. The microscopic model calculations include Scheil conditions, back diffusion in the solid, dendrite arm coarsening, and undercoolings of dendrite tip and the formation of eutectic mixture. The modeling results were verified with experimental measurements in present study.;The dendritic microstructure was found in all three alloys directionally solidified with cooling rates varying between 0.039 and 2 K/s. It was found that the area scan method is the best way for obtaining solute distributions in multi-component alloys with complex dendritic microstructure. The cylindrical geometry in the microscopic modeling was found to be the best for describing the dendrite arm growing. The model-calculated solute concentration profiles including the effects of back diffusion in the solid and dendrite arm coarsening were in good agreement with those experimental measurements. In contrast, the calculated results under the Scheil conditions were not satisfactory. For the cooling rates studied, the effect of undercoolings, of dendrite tip and eutectic can be neglected. It was found that the accuracy of phase diagram information for multi-component system had a significant influence on the calculation results. A weighted averaging procedure was used to get results in accord with experimental data for the model-calculated microsegregations of solute elements Mg and Zn when the remaining liquid reaches the region in which two solid phase form.
机译：通过微观模型耦合研究了两种三元富铝合金Al-3.9Cu-0.9Mg和Al-15Cu-1Mg以及四元富铝Al-3.86Cu-0.89Mg-0.99Zn合金的组织和偏析。与实际相图的信息。微观模型计算包括Scheil条件，固体中的向后扩散，枝晶臂粗大化，枝晶尖端过冷以及共晶混合物的形成。在本研究中，通过实验测量验证了建模结果。在定向冷却且冷却速率在0.039至2 K / s之间的所有三种合金中均发现了树枝状组织。研究发现，区域扫描法是获得具有复杂树枝状显微组织的多组分合金中溶质分布的最佳方法。发现显微建模中的圆柱几何形状是描述枝晶臂生长的最佳方法。由模型计算得出的溶质浓度分布图，包括固体中的反向扩散和枝晶臂粗化的影响，与实验测量值非常吻合。相反，在Scheil条件下的计算结果并不令人满意。对于所研究的冷却速率，可以忽略过冷，枝晶尖端和共晶的影响。结果表明，多组分系统相图信息的准确性对计算结果有重要影响。当剩余液体到达两个固相形式的区域时，使用加权平均程序获得与实验数据相符的结果，该结果与模型计算的溶质元素Mg和Zn的微观偏析有关。

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  • 作者

    Xie, Fanyou.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Engineering Materials Science.;Engineering Metallurgy.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 177 p.
  • 总页数 177
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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